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If a 20 kg object fell to the surgace of the Earth from a height of 30m, what would its final velocity be? (work from the energy standpoint)

I know that you said it is F * X and I'm just confused. Can you help me walk through this?

  • Physics -

    Work is defined as force * distance. The force here is weight, or mg. Work done by gravity is then mgh.

    Now, that work results in kinetic energy, 1/2 mv^2

    1/2 m v^2=mgh
    1/2 v^2=gh
    v= sqrt 2gh

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