Recent content by McNutt74

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    How Fast Does a Rock Fall from 20 Meters?

    Homework Statement A rock with a mass of 0.2 kg is dropped from a height of 20 m. At what velocity does the rock strike the ground?Homework Equations KE= 1/2mv^2 PE=mgh The Attempt at a Solution 0.2x9.81x20=1/2mv^2. 39.24=.1(v^2) 392.4=v^2 v=19.8 m/s First time doing one of these problems...