A car stops from 108 km/h in 4 seconds with constant deceleration. What is the deceleration?
Answer and explanation
Correct answer: A. 7.5 m/s^2
- Step 1: The speed is 30 m/s.
- Step 2: Deceleration = 30 / 4 = 7.5 m/s^2.
Answer
7.5 m/s^2.
Why not the others: The speed must first be converted to meters per second and then divided by the time.
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