A body starts from rest at a point, distance R 0 from the center of the earth of mass M, radius R. The velocity acquired by the body when it reaches the surface of the earth will be
A
GM 
B
2 GM 
C
D
2GM 
Text Solution
Verified by ExpertsThe correct answer is:
C
Initial total energy = Initial kinetic energy + initial potential energy
= 
m (0) 2 + 
= 
Total energy, when it reaches the surface of earth = 
mv 2 + 
Applying energy conservation,
mv 2 – 
= 
v = 
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