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A spherical planet far out in space has a mass  M0  and diameter  D0 . A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity which is equal to

(a)       GM0 /D02                             (b)     4m GM0 /D02

(c)      4 GM0 /D02                          (d)      GmM0 /D02

Answer:  c

(12)

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