Q.

A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum:

A. just after it is dropped
B. when it is just on the half-way
C. just before it touches the ground
D. when it touches the ground
Answer» C. just before it touches the ground
Explanation: When an object reaches the ground it has its maximum value of kinetic energy just before touching the ground. Since kinetic energy + potential energy= Constant; so on reaching ground the potential energy of an object becomes zero (0). The kinetic energy on reaching ground becomes maximum.
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