The expression for the gravitational force from certain distance from the center of a planet is given by; M P where 8 = G r 2 G is the universal gravitational constant. Mp is the mass of the planet. r is the distance from the center of the planet. What is true for the value of the gravitational acceleration? O g is directly proportional Mp. g is directly proportional to the square of r O g is inversely proportional to Mp g is independent of Mp