Physics
A boy lifts a luggage from height 2 m to 4 m. The potential energy will become:
- half
- double
- one-third
- one-fourth
Work, Energy & Power
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Answer
double
Reason — Potential energy (P.E.) is given by expression mgh.
In first case P.E. = mg2 or 2mg [h=2 m]
In second case P.E. = mg4 or 4mg [h=4 m]
So potential energy gets doubled.
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