Question
Physics Question on Escape Speed
The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is :
A
v
B
2 v
C
3 v
D
4 v
Answer
4 v
Explanation
Solution
Ve=R2GM=R2G34πR3ρ ⇒Ve∝R ∴VV′=R4R ⇒V′=4V