First slide

Gravitaional potential energy

Question

The escape velocity for a rocket on earth is 11.2 km/sec. Its value on a planet where acceleration due to gravity is double that on the earth and diameter ofthe planet is twice that of the earth will be in km/sec :

Easy

A

11.2
B

5.6
C

22.4
D

33.6

Solution

$v_{e} = \sqrt{\frac{2 GM}{R}} = \sqrt{2 gR}$

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