Physics
posted by Mark .
an 80kg man jumps off a 60m cliff, halfway to the ground, his GPE is 27,072J. What is his KE at the same moment?

Physics 
MathMate
Half way down is 30 m down.
Assuming the GPE reference is at the bottom of the cliff, then
GPE=mg(30)=27072 J
KE=(1/2)mv²
Equate GPE and KE.
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