Asked by mssailormouth

A 10 kg rock that has been dropped from a 60 meter high cliff experiences a average force of air resistance of 30 N. Calculate the KE at the bottom of the fall.
Answered by R_scott
KE = gravitational potential change - work against friction

KE = (m g h) - (60 m * 30 N)
Answered by mssailormouth
mgh does not help me I don't know what it means
Answered by mssailormouth
my book says PE gravity= mgh this is why I'm getting confused my book calls mgh PE and you say KE??
Answered by R_scott
"KE is equal to the gravitational potential change minus the work against friction"

KE = PE - (height * frictional force)
Answered by mssailormouth
ok so KE=PE gravity

which is mgh - h x friction force

(10*9.80*60)-(60*30)
=4080 J
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