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Math Help - easy physics question

  1. #1
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    easy physics question

    not very good at physics can someone help me with thit please:

    In the absence of air resistance, if a 2 kg ball with potential energy of 144 Joules relative to the floor is dropped, what will it's velocity be just before it hits the floor?
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  2. #2
    Senior Member ecMathGeek's Avatar
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    Quote Originally Posted by rcmango View Post
    not very good at physics can someone help me with thit please:

    In the absence of air resistance, if a 2 kg ball with potential energy of 144 Joules relative to the floor is dropped, what will it's velocity be just before it hits the floor?
    Law of Conservation of Energy:
    U0 + K0 = U1 + K1

    U0 = 144J
    K0 = 0
    U1 = 0
    K1 = ???

    144J + 0 = 0 + K1
    K1 = 1/2*mv^2 = 144J
    v = sqrt(144*2/m) = sqrt(288/2) = 12 m/s
    Last edited by ecMathGeek; April 24th 2007 at 02:43 PM.
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  3. #3
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    thankyou for the help on this one.
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