# ch02-p001 - 1. We use Eq. 2-2 and Eq. 2-3. During a time tc...

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1. We use Eq. 2-2 and Eq. 2-3. During a time t c when the velocity remains a positive constant, speed is equivalent to velocity, and distance is equivalent to displacement, with Δ x = v t c . (a) During the first part of the motion, the displacement is Δ x 1 = 40 km and the time interval is t 1 40 133 == ( . km) (30 km / h) h. During the second part the displacement is Δ x 2 = 40 km and the time interval is t 2 40 067 ( . (60 km / h) h. Both displacements are in the same direction, so the total displacement is Δ x = Δ x 1 + Δ x 2 = 40 km + 40 km = 80 km. The total time for the trip is t = t 1 + t 2 = 2.00 h. Consequently, the average velocity is
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## This note was uploaded on 09/03/2009 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.

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