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Question

A stone is thrown vertically up. What happens to its P.E. during its motion of upward journey?

A
Decreases till it becomes minimum
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B
Increases till it becomes maximum
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C
First decreases and then increases
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D
First increases and then decreases
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Solution

The correct option is B Increases till it becomes maximum
During its upward journey the velocity decreases and hence kinetic energy also decreases. To compensate the decrease in kinetic energy the potential energy increases to the extent at that instant.Hence at that top when velocity is zero, kinetic energy is also zero and potential energy is maximum. Thus P.E increases til it becomes maximum.

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