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Question

The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy?

A
Yes
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B
No
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C
Yes, at certain instants
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D
None of the above
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Solution

The correct option is B No
The law of conservation of energy says that energy cannot be created or destroyed and or in other words total energy of a system remains constant. When a ball starts falling, it's speed increases as it falls. So its kinetic energy keeps increasing ( K.E =12m×v2) as velocity increases and potential energy keeps decreasing (P.E =m×g×h) as height decreases. So, law of conservation of energy is not violated.

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