Posted by dave on Saturday, February 18, 2012 at 5:05pm.
assume potential energy = 0 when h = 0
U = m g h
U top = total energy = m (9.8 * 12)
=
U + Ke = U top
so
if U = Ke then
U = U top /2 = m (9.8 * 6)
so
at h = 6 meters
In other words, when it loses half its original potential energy, the Ke = U and that is halfway down.
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