Two solid spherical planets of equal radii R, having masses 4M and 9M, have their centres separated by a distance 6R. A projectile of mass m is sent from the planet of mass 4M towards the heavier planet. If the distance r of the point from the lighter planet where the gravitational force on the projectile is zero is kR, then calculate k.
Text Solution
Verified by ExpertsThe correct answer is:
B
The gravitational force on projectile of mass m at a distance 
from a planet of mass 4M is
zero.
or 
or
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