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...