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## Homework Statement

A ball hits the wall in a normal direction with v=10m/s. After the hit which lasted 0.2 Seconds, it turned in the same direction with v=10m/S. Knowing that its mass is 0.5 kg, find the average force that hit the wall.

## Homework Equations

F=m*a, a= (v-v

_{0})/t

## The Attempt at a Solution

a=(0-10)/0.2=-50m/S

_{2}, F= 50*0.5= 25N, but the answer is 50N