1. The problem statement, all variables and given/known data Just before hitting the ground, a partially inflated 0.625kg basketball has a speed of 3.30m/s. Then it loses half of its kinetic energy as it bounces. (A)What is the ball's speed immediately after it bounces?(B) If the ball is in contact with the ground for 9.25ms, what is the magnitude of the average force exerted by the ground on the ball? 2. Relevant equations None of these are positive but: KE=.5mv^2 Fav=m(Δv)/(Δt) 3. The attempt at a solution I found part A I believe. I just found the initial KE in that being KE=.5(.625)(3.30)^2 and got KE0=3.4 then it loses half so KEf=1.7 so to find the velocity I set up 1.7=.5(.625)v^2 and found the final velocity to be 2.33m/s. I am quite confused on part B. I have tried m(Δv)/(Δt) to find the Fav but didn't get the right answer (381N). What do I do?