A car traveling east at 42.4 m/s passes a trooper hiding at the roadside. The driver uniformly reduces his speed to 25.0 m/s in 4.00 s.
(a) What is the magnitude and direction of the car's acceleration as it slows down?

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  1. initial velocity = 42.4 m/s
    final velocity = 25.0 m/s
    time = 4.00s

    a =
    (final velocity - initial velocity)/time

    (25.0m/s - 42.4m/s)/ 4.00 s

    'sign' of answer determines direction of acceleration

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  2. North

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