Question

A stationary object is released from a point P a distance 3R from the centre of the moon which has radius R and mass M. Which one of the following expressions gives the speed of the object on hitting the moon ?

• A. $(\frac{2GM}{3R})^{\frac{1}{2}}$
• B. $(\frac{4GM}{3R})^{\frac{1}{2}}$
• C. $(\frac{2GM}{R})^{\frac{1}{2}}$
• D. $(\frac{GM}{R})^{\frac{1}{2}}$

Answer 1

Answer: (B)

$(\frac{4GM}{3R})^{\frac{1}{2}}$

Answer 2

The correct option is (B) : $(\frac{4GM}{3R})^{\frac{1}{2}}$.