1. The problem statement, all variables and given/known data A tennis ball of with a mass of .045 kg and speed of 25 m/sec strikes a wall at an angle of 45 degrees and rebounds with the same spped at 45 degrees. What is the impulse given the wall? 2. Relevant equations I= pf-pi/t 3. The attempt at a solution I= mv-mv/t (.045)(25)-(-.045)(25)/1 1.125-1.125/1 I=2.25 I know the answer is 2.1, but don't know how to get it.