Such a long problem. I wish I had the time. Sorry.

If I help you with some of them maybe you would love me like for a while.

1. Weight = m*acceleration due to gravity
Solve for m

2. B lifts it farther off the floor. Potential energy is m*g*h. So B gave the weight more potential energy. From conservation of energy, the work done is equal to the potential energy given to the weight by getting it up there. So in other words, work done is m*g*h. And h is bigger for B.

3. Peculiar. It’s none of the above. It looks like your typing wasn’t 100%. Could it be that one of the choices should have been 128 kg-m/s? Momentum is m*v

5.) Power = work done/time.
1 Watt = 1 Joule/sec = 1 Newton-m/sec
I said above that potential energy is m*g*h. You have the man’s weight in Newtons so the m*g part of the potential energy is 600 Newtons. The h is 2 meters. So in a second he did work of
m*g*h = 600 Newtons*2 meters = 1200 nt*m. If he continued and did another 2 meters the next second you see that his rate of work is 1200 nt*m/s.
Or 1200 W

6. The vertical acceleration the whole time is g = 9.8 m/s^2. Velocity changes, even changes sign first it’s going up then down. But acceleration is constant.

7. Momentum is conserved. Momentum = mass*velocity
Momentum before = momentum after
3 kg*0 m/s + 1 kg*6 m/s = (3 kg + 1 kg)*Vafter
Solve for Vafter

10. Potential energy = work done to get the car there = m*g*h
m*g*h = 1700 kg*9.8 m/s^2*2 m
crank out the answer

11. Not a, the 2nd ball will land at the foot of the building, while the 1st is out there somewhere. Probably in the neighbor’s yard.

Not b, they fall for the same amount of time but the 1st went farther therefore had higher velocity.

Not c, the 1st had horizontal velocity of 15 meters per second while the 2nd had no horizontal velocity.

Yes d, they both started with vertical velocity of zero.

18. This one is harder. The object’s velocity increases at a constant rate. V = Vo + g*t

Kinetic energy = (1/2)*m*V^2
So the kinetic energy increases with the square of time.

Ahhh, I’m feelin’ the love.

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1.) The acceleration due to gravity on the surface of planet X is 19.6 meters per second squared. If an object on the surface of this planet weighs 980.0 newtons.

Mass of the object = weight / g =980/19.6=50 kg

The correct choice is …………………a.50.0 kg
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2.) Two weightlifters raise identical 50.-kilogram masses above their heads. Weight lifter A lifts the mass 1.5 meters, while Weight lifter B lifts the mass 2.0 meters.

The work done by the weightlifter B is more because he lifts the weght over a larger height (2 m)

The correct choice is …….a. Weight lifter B does more work
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3.) The magnitude of the momentum of an object is 64.0 kilogram-meter per second. If the velocity of the object is doubled, the magnitude of the momentum of the object will be
doubled because momentum of given object is directly proportional to its velocity

momentum will be 64*2=128 kgm/s

NOTE: answer ‘c’ appears to be misprint, if answer ‘c’ is 128 kgm/s then it is correct
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4.) A circus worker uses a pulley with a 10-m rope to lift a 900-N tiger to a 5-m platform. His effort force is 450 N.

The mechanical advantage of the pulley=Load / effort =900 /450 = 2

Answer ‘c’ 2 is correct
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5.) A 600-newton man climbing a rope a distance of 2 meters in 1 second.

Power developed =work / time =force*distance / time =600*2/1=1200 W

The correct answer is ‘d’. 1200 W
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6.) A ball is thrown at an angle to the horizontal.The ball’s vertical acceleration during the time the ball is in the air remains same

The correct answer is ‘d’ It remains the same
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7.) A 3.0-kilogram steel block is at rest on a frictionless horizontal surface. A 1.0 kilogram lump of clay is propelled horizontally at 6.0 meters per second toward the block. Upon collion, the clay and steel block stick together .

The initial momentum of the system = 1*6 = 6 kgm/s

Final momentum of the system =4*v

As momentum is conserved, 4*v = 6

v=6 / 4 = 1.5 m/s

The correct answer is ‘a’ 1.5 m/s
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8.) Air bags help to minimize injuries by providing a large area for the force of impact to be exerted. In terms of the impulse-momentum theory, another advantage of an air bag is that it increases the amount of time the force is applied

The correct answer is …b increases the amount of time the force is applied
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9.) A force of 1000 N is exerted on a golf ball for 0.005 s. The change in momentum of the golf ball is force*time that is 1000*0.005 = 5 kgm/s

The correct answer is a. 5 kg m/s
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10.)The minimum amount of work done by the hydraulic lift to raise a1700 kg automobile 2.0 m vertically is 1700*2=3400 J

The correct answer is b. 3400 J
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11.) A ball is thrown horizontally from the top of the building with an initial velocity of 15 meters per second. At the same instant, a second ball is dropped from the top of the building. The two balls have the same initial vertical velocity

The correct answer is ‘d ‘ initial vertical velocity
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12.) Stopwatch is most useful in determining the kinetic energy of a 75 g battery-powered car traveling a distance of 25 m. After measuring time, we can find acceleration and then force. Force *distance gives kinetic energy

The correct answer is d. stopwatch
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13.) The tools needed to determine the amount of work done in stretching a rubber band are spring scale and ruler

The correct answer is a. spring scale and ruler
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14.) A person moves a large box across a level floor by applying a horizontal force of 300 N. If the person pushes the box a distance of 6 meters in 10 seconds,the person does 300*6=1800 J of work on the box

The correct answer is c. 1800 joule
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15.) A 10-kilogram ball is fired with a velocity of 500 meters per second from a 1,000 kilogram cannon. The recoil velocity of the cannon 10*500/1000 =5 m/s

The correct answer is a. 5 m/sec
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16.) A 120 kg lineman moving right at 2 m/s tackles an 80 kg football fullback moving left at 8 m/s. After the collision, both players move left at 2 m/s. The momentum of the players after the collision is : momentum of lineman= 240 kg m/s and momentum of fullback =160 kg m/s

The correct answer is a. momentum of lineman= 240 kg m/s and momentum of fullback =160 kg m/s
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17.) A baseball player throws a ball horizontally. The statement best describes the ball’s motion after it is thrown is that (neglect the effect of friction)It’s vertical speed increases, and its horizontal speed remains the same

The correct answer is d. It’s vertical speed increases, and its horizontal speed remains the same
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18.) An object falls freely near the Earth’s surface. The relationship between the object’s kinetic energy and its time of fall is that Kinetic energy increases by time squared

The correct answer is d. Kinetic energy increases by time squared
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