Average Speed and Velocity | Answer Key - Edubirdie

University:
Campbell University
Course:
PHYS 221 | General Physics I
Academic year:

2021
Views:

69

Pages:

2
Author:

aprivantuqy

**Average Speed and Velocity** **Name:** **1. A turtle moves 3.5 m east in 136 s and then moves 1.7 m west in 88 s.** a) What is the average speed of the turtle? Speed = Distance/Time s_avg = (d1 + d2) / (t1 + t2) s_avg = (3.5 + 1.7) / (136 + 88) s_avg = 0.023 m/s b) What is the average velocity of the turtle? Velocity = Change in Displacement / Time v_avg = (d2 - d1) / (t2 - t1) v_avg = (1.7 - 3.5) / (224 - 0) v_avg = -0.0080 m/s **2. A cyclist rode her bicycle for a little over 4.0 min. Her displacement was recorded and a displacement-time graph was constructed below.** [Image of a displacement-time graph] a) When was the cyclist's speed the greatest? The speed was greatest when the slope of the line is the steepest. This occurs between either 165-185 s or from 240-255 s. b) When was the velocity of the cyclist the greatest? The velocity is greatest at the same time as the speed was greatest, from 165-185 or 240-255 s. c) When was the cyclist's displacement 300 m north? At about 108 1 d) What was the cyclist's average velocity for the first 70 s? v_avg = Δd/Δt v_avg = 215/70 v_avg = 3.07 m/s north e) What was the cyclist's average speed for the entire trip? s_avg = Δd/Δt s_avg = 430/255 s_avg = 3.65 m/s f) Did the cyclist stop at any time during the ride? If so, at what time? Yes, she stopped at about 155 seconds when she turned around. g) What was the cyclist's average velocity for the first 200 s? v_avg = Δd/Δt v_avg = 200-0/200-0 v_avg = 1 m/s north h) What was the cyclist's average velocity for the entire trip? v_avg = Δd/Δt v_avg = 0-0/255-0 v_avg = 0 m/s

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