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Q.

A man can jump to a height of 1.5 m on a planet A. What is the height he may be able to jump on another planet whose density and radius are, respectively, one-quarter and one-third that of planet A

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a

1.5 m

b

15 m

c

18 m

d

28 m

answer is C.

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Detailed Solution

H=u22g⇒H∝1g⇒HBHA=gAgB Now gB=gA12 as g∝ρR∴HBHA=gAgB=12⇒HB=12×HA=12×1.5=18 m
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