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  1. A spherical planet has a mass MP and diameter DP. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity, equal to :
    1. 4 G MP / DP2
    2. ​G MP m / DP2
    3. G MP / DP2
    4. 4 G MP m / DP2
Correct Option: A

Gravitational attraction force on particle B,

Fg =
G MP m
DP / 2)2

Acceleration of particle due to gravity
a =
Fg
 =
4G MP
mDP2


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