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+1 vote
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in Physics by (54.6k points)

A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5m above the ground.

(Take g = 10 m s-2)

(a) Calculate the potential energy possessed by the ball when initially at rest.

(b) what is the kinetic energy of the ball just before it hits the ground?

(c) what happens to the mechanical energy after the ball hits the ground and comes to rest?

1 Answer

+1 vote
by (89.9k points)
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Best answer

(a) Potential energy of the ball = mgh

= 2 x 10 x 5 =100J

(b) Kinetic energy of the ball just before hitting the ground = Initial potential energy= mgh = 2 x 10 x 5 =100J

(c) Mechanical energy converts into heat and sound energy.

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