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Posted by on Monday, June 18, 2012 at 8:03pm.

An 85 kg football player traveling 4.7 m/s is stopped in 1.0 s by a tackler. What is the original kinetic energy of the player? (I tried using 1/2 m v^2 but that doesn't seem to be right. How do I manipulate the formula?) What average power is required to stop him?

  • physics - , Monday, June 18, 2012 at 8:57pm

    It is right, 1/2 m v^2 is the original KE.

    average power= energy/timestopping

  • physics - , Thursday, December 17, 2015 at 7:11am

    50 joules

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