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Quiz3Solutions

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

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

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