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Math Help - Physics question: Work done by gravitational force

  1. #1
    TGS
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    Physics question: Work done by gravitational force

    A ball of mass 0.9 kg falls downward, as shown in the diagram above. Initially you observe it to be 4.5 m above the ground. After a short time it is just about to hit the ground.
    During this interval how much work was done on the ball by the gravitational force?

    I've tried using Mass * 9.8 N/kg * 4.5 m

    but that didn't work.
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  2. #2
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    Quote Originally Posted by TGS View Post
    A ball of mass 0.9 kg falls downward, as shown in the diagram above. Initially you observe it to be 4.5 m above the ground. After a short time it is just about to hit the ground.
    During this interval how much work was done on the ball by the gravitational force?

    I've tried using Mass * 9.8 N/kg * 4.5 m

    but that didn't work.
    W = F \cdot d = mgd = (0.9 \, kg)(9.8 \, m/s^2)(4.5 \, m)
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  3. #3
    TGS
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    Yes.. that didn't work. That was the first formula I used.
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  4. #4
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    Quote Originally Posted by TGS View Post
    Yes.. that didn't work. That was the first formula I used.
    the equation is correct ...

    what did you calculate?
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  5. #5
    TGS
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    ugh.. i figured it out.

    I obviously can't read properly because I entered in 36.69J instead of 39.69J.
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