# Answer on Mechanics | Relativity Question for Paromita Mukherjee

Question #49252

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

1. (2GM/3R)^1/2

2. (4GM/3R)^1/2

3. (GM/3R)^1/2

4. (GM/R)^1/2

1. (2GM/3R)^1/2

2. (4GM/3R)^1/2

3. (GM/3R)^1/2

4. (GM/R)^1/2

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## Comments

Assignment Expert15.12.2016 12:41Dear Ashish, this is wrong way since the acceleration of the object is not uniform for such large distances.

Ashish08.12.2016 18:31Why cannot we use

Acceleration = GM/9R^2

And use third equation of motion

V^2 -u^2 = 2 a s

Where s= 2R

U=0

Answer do not match then

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