Homework Help: Physics

Posted by Alex on Friday, March 30, 2012 at 10:07pm.

A girl of mass 55 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with the same speed. The ball is in contact with the wall 0.05 s. What is the average force exerted on the wall by the ball?

A) 400 N
B) 800 N
C) 55,000 N
D) 27,500 N
E) 13,750 N

Physics - drwls, Friday, March 30, 2012 at 11:18pm
(Avg force) x (contact time) = momentum change
= 55*50 kg*m/s

Avg. force = 0.8*50/.05 = ____ N

One of the choices works.

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