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an 800kg car traveling at 63 mph (28 m/s) needs to come to stop on 8.0...

an 800kg car traveling at 63 mph (28 m/s) needs to come to stop on 8.0 seconds. what is the average breaking force needed

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Answer #1

Mass of the car = m = 800 kg

Initial speed of the car = V1 = 63 mph = 28 m/s

Final speed of the car = V2 = 0 m/s (Comes to a stop)

Time period = T = 8 sec

Average braking force = F

Average force is equal to the rate of change of momentum that is change of momentum divided by the time period.

F = -2800 N

The negative sign indicates its slowing down the car that is the direction of the force is opposite to the motion of the car.

Average braking force = 2800 N

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