Physics(Please respond)

1) A penny is dropped from rest from the top of a very tall building. Assuming the height of the building is 407 m and ignoring air resistance, find the speed with which the penny strikes the ground.

I am not sure how to start this. Thank you!

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  1. V = sqrt(2 g X)

    Why? Because
    M g X = (1/2) M V^2

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