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Got it — Thanks John!!
I am having a problem with #40 (baseball reaching batter at 32 m/s). I can't seem to get 114 m/s for the speed of the outgoing ball. How should I approach this problem.
Manuel, the key to the problem is that it is an elastic collision. Use the relative velocity formula for elastic collisions: (v sub 1 minus v sub 2) = -(v prime sub 1 minus v prime sub 2). v prime is the velocity of the objects after the collision. Have the baseball initially moving in the positive x direction. The bat is moving in the neg x direction with the same speed both before and after the collision. If that doesn't help, please let me know and I'll post the solution. John
Got it. Thank you very much John.