The driver of a car traveling at 110 km/h slams on the brakes so that the car undergoes a constant acceleration, skidding to a complete stop in 4.5 s. What is the average acceleration of the car during braking?
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Average acceleration = change in speed / time
Don't forget to convert to SI units first (i.e. convert speed from km/h to m/s)
110 km/h = 110 x 10^3 m / 3600 s = 30.56 m/s
Acceleration = -30.56 / 4.5 = -6.79 m/s^2
Don't forget to convert to SI units first (i.e. convert speed from km/h to m/s)
110 km/h = 110 x 10^3 m / 3600 s = 30.56 m/s
Acceleration = -30.56 / 4.5 = -6.79 m/s^2
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There are 3,600 seconds in an hour (60 x 60 = 3600)
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