# 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

December 29, 2020 | education

| **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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