Superman throws a 2400-N boulder at an adversary. What horizontal force must Superman apply to the boulder to give it a horizontal acceleration of 12.0 m/s2?
Solution 17E According to Newton's 2 nd law F=ma And we have relation between mass and weight w=mg m= g = 24002N 9.8 m/s =244.9 kg Mass of the boulder is 244.9 kg Now F=ma 2 =244.9 kg×12 m/s =2940 N 2940 N horizontal force is required to Superman