A ball falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.

Potential energy

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Kinetic energy

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Heat energy

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None of the above

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Solution

The correct option is D Kinetic energy
After reaching the ground it will not have any height from the ground hence no potential energy as it is defined as virtue of state of its position where as it has velocity by which it can be said that kinetic energy exists as it is defined by virtue of state of its motion.While falling potential energy keeps on changing in kinetic energy and on reaching the ground all potential energy changes to kinetic energy.Hence there exists only kinetic energy.

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Similar questions

2 k g

5 m

g = 10 m s^{- 2}

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?

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