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Work Energy Theorem Application

A box of mass...

Question

A box of mass m slides down a frictionless inclined plane of length L and vertical height h. Calculate the kinetic energy at the bottom of plane.

A

mgL

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B

mgh

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C

mgL/h

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D

mgh/L

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E

mghL

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Solution

The correct option is B mgh
The potential energy at height at h is $m g h$
According to conservation of energy, the potential energy is converted into kinetic energy.
Thus, kinetic energy will be $m g h$

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