First slide

Gravitaional potential energy

Question

The ratio of the radius of earth to that of the moon is 10. The ratio of acceleration due to gravity on the earth and on the moon is 6. The ratio of the escape velocity from the earth's surface to that from the moon is :

Easy

A

10
B

6
C

nearly 8
D

1.66

Solution

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

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