The driver of a car traveling at a speed of 18 m/s slams on the brakes and comes to a stop in 4 s. If we assume that the car's speed changed at a constant rate (constant net force): What was the car's average speed during this 4 s interval?
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Since the car starts at speed of 18 m/s, then it comes to rest, and because the net force on the car is constant, then the average velocity of the car is
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Speed of the travelling car is,
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The average velocity in motion with constant acceleration.