The Radius of Earth Is 6378 Km

Multiple Choice

The radius of Earth is 6378 km.The force of gravity on a 1 kg ball at Earth's surface is 9.8 kg m s ^{- 2}.What is the force of gravity on this same ball when the ball is located 12,756 km from Earth's center? G = 6.67*10 ^{- 11} N m² kg ^{- 2}

A) 2.45 kg m s ^{- 2}
B) 39.2 kg m s ^{- 2}
C) 4.9 kg m s ^{- 2}
D) 19.6 kg m s ^{- 2}
E) 9.8 kg m s ^{- 2}