1. The problem statement, all variables and given/known data A golf ball released from a height of 1.5m above a concrete floor bounces back to a height of 1.1m. If the ball is in contact with the floor for 6.2 X 10^-4 s, what is the average acceleration of the ball while in contact with the floor? g= 9.81 m/s^2 x-xo= -1.5 vo= 0 t= 6.2 X 10^-4 Are these variables all correct? 2. Relevant equations t= ((-2(x-xo))/g)^(-1/2) average acceleration= (v2-v1)/(t2-t1) 3. The attempt at a solution t= ((-2(-1.5m)/(9.81m/s^2))^(1/2)= 0.55s Do I take initial velocity divided by this time number? And is final velocity just 1.1 divided by time?