# physics

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A 7 kg purse is dropped from the top of the Leaning Tower of Pisa and falls 53 m before reaching the ground with a speed of 17 m/s. What was the average force of air resistance?

F_{average} =

• physics -

loss of potential energy = m g h

gain of kinetic energy = (1/2)m v^2

difference = work against friction
which = F * 53 neters

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