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Question

The kinetic energy of a moving cart when its mass is doubled and speed remains the same.

A
gets doubled
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B
gets tripled
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C
remains same
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Solution

The correct option is A gets doubled
The kinetic energy of a moving body is given by:
KE=12mv2
where:
m - Mass of the body
v - Speed of the body.

If mass m is doubled, new mass is given by:
m=2m
Speed is kept the same.
New kinetic energy is given by:
KE=12mv2
KE=12(2m)v2
KE=2KE

Hence, kinetic energy is doubled.

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