The driver of a car moving at a speed of 72 km / h, seeing a speed limit sign up to 40 km / h, starts to brake and slows down in 10 seconds. With what acceleration did the car move during braking?
Acceleration with uniformly accelerated motion (uniformly slowed down) is directly proportional to the difference in speeds and inversely proportional to time:
a = delta V / t = 32/10 = 3.2m / s ^ 2
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