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CH 2 Questions

# Exercises 1 displacement is the change in position

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Unformatted text preview: trip), while the average speed is never zero. 5. Yes, this is possible. The jogger can jog in the opposite direction during part of the jog (negative instantaneous velocity) as long as the overall jog is in the forward direction (positive average velocity). Exercises 1. Displacement is the change in position. Therefore the magnitude of the displacement for half a lap is 300 m . For a full lap (the car returns to its starting position), the displacement is zero . 2. vav = d/t, where d = 80 km + 50 km = 130 km t1 = d1/v1 = (80 km)/(100 km/h) = 0.800 h t2 = d2/v2 = (50 km)/(75 km/h) = 0.667 h t = t1 + t2 = 0.800 h + 0.667 h = 1.467 h vav = d/t = (130 km)/(1.467 h) = 89 km/h 100 yd ⎛ྎ 3 ft ⎞ྏ ⎛ྎ 1 m ⎞ྏ = 10.1...
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