alleryStart learning →A racehorse accelerates from rest to a velocity of 15.0 m/s in 1.80 s. What is the magnitude of its average acceleration?
A8.33 m/s^2
B15.0 m/s^2
C27.0 m/s^2
D0.120 m/s^2
Answer & Solution
Correct answer: A. 8.33 m/s^2
1. Starting from rest means the initial velocity is 0 m/s.
2. The change in velocity therefore equals the final velocity, 15.0 m/s.
3. Average acceleration is the change in velocity divided by the elapsed time.
4. Substitute the values: (15.0 m/s) / (1.80 s) = 8.33 m/s^2.
5. Multiplying instead of dividing gives 27.0 m/s^2, which is the trap.
_Source: OpenStax College Physics (CC BY 4.0), Ch 2 "Kinematics", section 2.4 Acceleration_
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