a 980 n object is placed on mars that has a mass of 6.39 × 1023 kg and a radius of 2, 106 mi, how much does the object weight on mars. 4. extra credit: three objects of identical mass 2 kg are in a straight horizontal line such that the middle object is 5 m away from each of its adjacent objects as seen below 5 m 5 m find the magnitude and direction of the gravitational force exerted on the rightmost object.