Momentum Unit

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4 Comments

Genevieve Callahan • 1 year agologin to reply

Got it — Thanks John!!

Manuel Tejelo • 10 months, 2 weeks agologin to reply

Hello, 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. Thanks.

John Ennis • 10 months, 1 week agologin to reply

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

Manuel Tejelo • 10 months, 1 week agologin to reply

Got it. Thank you very much John.

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