# physics

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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 -

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

average power= energy/timestopping

• physics -

50 joules

• physics -

934 joules

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