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Question

The acceleration due to gravity on the moon is one-sixth that on the earth. If a high jumper can jump 2m on earth, then what distance can he jump on the moon?

A
2m
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B
12m
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C
6m
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D
8m
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Solution

The correct option is A 12m
The reason why we come down when jumping is the gravitational pull. Let's imagine that F force was required for us to jump 2m with g gravitational force. Mathematically,
g generates 2m of height in jump.
We know, P.Egh (as potential energy=mgh and mass and energy will be constant)
When g changes to g6, the potential energy will still be the same.
Hence, mgh1=mg6h2
or,h2=2×6=12m, which is our required answer.

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