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.

so KE=PEgravity 5880 is the PE but no friction force deducted...do I just subtract 30N?
my book is not clear...
Answered by bobpursley
KE at bottom=PE at top - friction=PE at top - forcefriction*height
Answered by mssailormouth
so 60 x 30
5880-1800=4080
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