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17 October, 23:54

A car is going 60.0 mi/h and has to stop in 6.0 seconds. What is the car's acceleration?

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Answers (2)
  1. 18 October, 00:05
    0
    The driver must accelerate the car at the average rate of

    - 10 mile / hour-second

    for 6 seconds.
  2. 18 October, 00:09
    0
    Convert mi/h to ft/s.

    60.0 mi/h * (5280 ft/mi) * (1 h / 3600 s) = 88.0 ft/s

    Find the acceleration.

    a = Δv / Δt

    a = (0 ft/s - 88.0 ft/s) / 6.0 s

    a = - 14.7 ft/s²
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