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Q.

Escape velocity on a planet is  ve. If radius of the planet remains same and mass becomes 4 times, the escape velocity becomes

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a

4 ve

b

2 ve

c

ve

d

12ve

answer is B.

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Detailed Solution

ve=2GMR⇒ve∝M if R= constant If the mass of the planet becomes four times then escape velocity will become 2 times.
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