A ball falls to the ground as shown below :

(a) What is the kinetic energy of ball when it hits the ground ?

(b) What is the potential energy of ball at B ?

(c) Which law you have made use of in answering this question ?

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Solution

(a) 80 J

(b) 32 J

(c) Law of conservation of energy.

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Similar questions

A ball of mass m is thrown vertically up with an initial velocity so as to reach a height h.The correct statement is :

(a) Potential energy of the ball at the ground is mgh.

(b) Kinetic energy of the ball at the ground is zero.

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

(a) Taking g=10 m $s^{- 2}$ ,calculate:

(i) the potential energy possessed by the ball when it is initially at rest.

(ii) the kinetic energy of the ball just before it hits the ground?

(b) What happens to the mechanical energy after the ball hits the ground and comes to rest?

10 k g

10 m

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