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PracticeTest1Solution-EP1-S07

# PracticeTest1Solution-EP1-S07 - Engineering Physics 1(Phys...

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16 3. A car travels on a straight road for 20 km at 40 km/h. It then continues in the same direction for 1.0 hours at 60 km/h. What is the average velocity of the car during the complete trip? (Assume that it moves in the positive x direction.) Δ t 1 = Δ x 1 /v 1 Δ x 2 = v 2 Δ t 2 = (20 km)/(40 km/h) = 0.5 h = (60 km)(1 h) = 60 km Since both displacements are in the same direction, Δ x = Δ x 1 + Δ x 2 = 20 km + 60 km = 80 km. The total time for the trip is Δ t = Δ t 1 + Δ t 2 = 1.5 h. Therefore the average velocity is v avg = Δ x/ Δ t = (80 km)/(1.5 h) = 53 km/h b) The car now travels on a straight road for 20 km at 40 km/h. It then travels in the opposite direction for 1.0 hours at 60 km/h. Is the average velocity
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PracticeTest1Solution-EP1-S07 - Engineering Physics 1(Phys...

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