The radius of Earth is 6,378 km. The force of gravity on a 1 kg ball at Earth's surface is 9.8 kg m/s2 . What is the force of gravity on this same ball when the ball is located 12,756 km from Earth's center? Hint: G = 6.67 10^-11 m3/s2/kg
a. 2.45 kg m/s2
b. 4.9 kg m/s2
c. 9.8 kg m/s2
d. 19.6 kg m/s2
e. 39.2 kg m/s2
a
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