[" 8.A spherica (planet) has a mass "M_(p)" and diameter D_p "],[" A particle of mass "m" falling freely near the surface "],[" of this planet will experience an aceleration due "],[" to gravity,equal to :- "],[[" (1) "GM_(p)/D_(P)^(2)," (2) "4GM_(p)m/D_(p)^(2)],[" (3) "4GM_(p)/D_(p)^(2)," (4) "GM_(p)m/D_(p)^(2)]]