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Math Help - calculating the loss of energy

  1. #1
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    calculating the loss of energy

    A tennis ball of mass 60g is launched from ground level vertically upwards with a
    speed of 30 m/s and reaches a height of 15m. Compute the loss of energy due to air
    resistance.

    I believe the loss of energy is equal to the work done. So i'm looking for force x distance
    but am unsure about the force. My answer would be 60 x 9.8 x 15 but then why give me the speed
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  2. #2
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    Quote Originally Posted by poirot View Post
    A tennis ball of mass 60g is launched from ground level vertically upwards with a
    speed of 30 m/s and reaches a height of 15m. Compute the loss of energy due to air
    resistance.

    I believe the loss of energy is equal to the work done. So i'm looking for force x distance
    but am unsure about the force. My answer would be 60 x 9.8 x 15 but then why give me the speed
    the initial energy of the ball is all kinetic energy ...

    E_0 = \dfrac{1}{2}mv^2

    the final energy of the ball is all gravitational potential energy ...

    E_f = mgh

    energy "loss" ...

    \Delta E = E_f - E_0
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  3. #3
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    Quote Originally Posted by skeeter View Post
    the initial energy of the ball is all kinetic energy ...

    E_0 = \dfrac{1}{2}mv^2

    the final energy of the ball is all gravitational potential energy ...

    E_f = mgh

    energy "loss" ...

    \Delta E = E_f - E_0
    Thanks.
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