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About nevada

  • Birthday 06/04/1987

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  1. A rock is thrown downward from the top of a 40.0-m-tall tower with an initial speed of 12 m/s. Assuming negligible air resistance, what is the speed of the rock just before hitting the ground? i asked this question somewhere else, but i still don't understand how to do it, the person told me to "Make assumptions like negligible air resistance, starting velocity is zero. Combining and rearranging the equations:" Ek = 1/2mv^2 Eg = mg(delta)h but i do not know where to put what in. the only thing i did was i draw the diagram, i have no idea what else to do. can you please explain how to do this. thank you
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