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March 24, 2017

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A ball of mass 0.70 kg moving with speed of 1.0 m/s hits a wall and bounces back with the same speed in the opposite direction. What is the change in the ball's kinetic energy?

  • physics - ,

    The speed doesn't change. What does that tell you?

    If you don't know, review the definition of kinetic energy:

    (1/2) M V^2

    Even if the velocity changes sign, V^2 does not change sign.

    The mass M doesn't change, either.

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