Gravitation Question 169

Question:If the radius of a planet is four times that of earth and the value of g is same for both, the escape velocity on the planet will be[RPET 2002]

Options:

A) [11.2,,km/s]

B) [5.6,,km/s]

C) [22.4,,km/s]

D) None

Show Answer

Answer:

Correct Answer: C

Solution:

[v=2gR]

Þ [vpve=gpge×RpRe=1×4=2]

Þ [vp=2×ve=2×11.2=22.4 km/s]

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