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Posted by on Thursday, September 20, 2012 at 11:35pm.

After falling from rest from a height of 35 m, a 0.49 kg ball rebounds upward, reaching a height of 25 m. If the contact between ball and ground lasted 1.7 ms, what average force was exerted on the ball?

  • Physics - , Friday, September 21, 2012 at 2:05am

    Use the two heights to get the velocity before and after impact with the ground.
    From those two velocities (in opposite directions) get the momentum change.

    The average force is the momentum change during the bounce, divided by the contact time.

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