**1. The problem statement, all variables and given/known data**

a ball having a mass of 150 g strikes a wall with a speed of 5.2 m/s and rebounds with only 50% of its initial kinetic energy. what is the magnitude of the impulse on the wall from the ball?

**2. Relevant equations**

I=Ft

I=ΔP

KE= 1/2 m v^2

**3. The attempt at a solution**

the answer is 1.3 N s but i dont know how to get there.

http://ift.tt/OuOvyB