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OpenStudy (anonymous):
A 10-kg rock is being dropped from 320 meters. What is its kinetic energy before it is released?
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OpenStudy (anonymous):
KE before it is released is 0, bcoz it has energy stored (WORK IS DONE AGAINST THE GRAVITY) in the form of potential energy. That is W= P.E, as energy is conserved hence {PE+KE=energy total} KE is zero.
OpenStudy (anonymous):
Any object at rest has zero kinetic energy.
OpenStudy (anx):
|dw:1420744418831:dw| Included a diagram, but these other two guys are right. Its a stationary object, so its kinetic energy is zero.
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