[填空题]
A 2.0-kg purse is drov:n9pom.u1lojtc;vix yo . wo fx i +-.xf25s.pp**mgdgqi;di; u(.o h ied from the top of the Leaning Tower of Pisa and falls 55 m before reaching the ground with ;i. *dmi;(ougihgq d*a speed of What was the average force of air resistance?
