Compute the acceleration of gravity for a given distance from the earth's center, distcenter, assigning the result to accelgravity. the expression for the acceleration of gravity is: (g * m) / (d2), where g is the gravitational constant 6.673 x 10-11, m is the mass of the earth 5.98 x 1024 (in kg) and d is the distance in meters from the earth's center (stored in variable distcenter).