# physics

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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?

• physics -

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

• physics -

North

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