- #1
ObviousManiac
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Homework Statement
"A 0.15 kg apple falls from a branch 20 m above the ground. If it hits the ground with a speed of 17 m/s, what was the average friction force (due to air resistance) exerted on the apple?"
Homework Equations
At first, I thought I would use conservation of energy, PE = KE + Ff (where Ff is force due to friction) but I think there's something wrong with that.
The Attempt at a Solution
Using conservation of energy I found Ff to be 7.725 (Joules? I think this should be in Newtons...), but I would expect it to be significantly lower.