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On the same velocity vs. time graph, the velocity is 40 m/s at t = 5 s and 140 m/s at t = 25 s, rising in a straight line. What is the average acceleration between those two times?
A2 m/s^2
B4 m/s^2
C5 m/s^2
D20 m/s^2
Answer & Solution
Correct answer: C. 5 m/s^2
1. Average acceleration is change in velocity divided by change in time.
2. delta v = 140 m/s - 40 m/s = 100 m/s. delta t = 25 s - 5 s = 20 s.
3. a = 100 m/s / 20 s = 5 m/s^2.
_Source: OpenStax Physics (CC BY 4.0), Ch 2 "Motion in One Dimension", section 2.4 Velocity vs. Time Graphs_
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