Quiz3Solutions - Quiz 3 10/15/10 Assume g=10m/s2 for all...

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Quiz 3 10/15/10 Assume g=10m/s 2 for all problems. Problem 1. A person falls from a fifth-story window 20m above a firefighter’s safety net. The survivor stretches the net 2.0m before coming to rest. Express answers using two significant figures. a) What is the velocity of the person just before hitting the net? Take up direction to be positve. Solution We know that intially there is no velocity. In addition, we only know the distance and acceleration so, v 2 f = v 2 i + 2 ax v 2 f = 2 ax = 2( - 10)( - 20) = 400 Now since the up direction is positve we have, v f = - 20 .m/s b) What is the average deceleration experienced by the survivor when he was slowed to rest by the net? Solution We know that when the person hits the net his initial velovity will be given by the answer from (a) and his final velocity will be zero when he is stopped. The last piece we need is that the this occurs in 2.0m. v
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This note was uploaded on 11/21/2010 for the course PHYSICS Physics 2 taught by Professor Manojkaplinghat during the Fall '10 term at UC Irvine.

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Quiz3Solutions - Quiz 3 10/15/10 Assume g=10m/s2 for all...

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