First slide

Gravitaional potential energy

Question

For a planet having mass equal to mass of the earth but radius is one fourth of radius of the earth, then escape velocity for this planet will be :

Easy

A

11.2 km/s
B

22.4km/s
C

5.6 km/s
D

44.8 km/s

Solution

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

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