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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?

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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