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Question

# The weight of a person on a planet A is about half that on the earth. He can jump upto 0.4m height on the surface of the earth. How high he can jump on the planet A ?

A
0.8m
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B
1m
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C
1.2m
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D
1.4m
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Solution

## The correct option is A 0.8mmass m kglet, weight of the man on earth W1weight of the man on planet A W2given: W2=W12or mg′=mg2or g′=g2potential energy used by him to jump height of 0.4m on earth is 0.4mg.if he apply same potential energy on planet A with acceleration due to gravity g′ he would move a height h′ so,mgh=mg′h′ since,g2=g′g×0.4=g2h′so, h′=0.8mhence, he can jump on the planet A up to height of 0.8m.

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