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A car of mass 500kg travelling at 36km/hr brought to rest over a distance of 20m calculate 1.The average retardation 2.The aver...Asked by Emmanuel
A car of mass 500kg travelling at 36km/hr brought to rest over a distance of 20m calculate 1.The average retardation 2.The average braking force
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Answered by
R_scott
36 km/hr = 10 m/s
average braking velocity = (10 m/s + 0) / 2 = 5 m/s
braking time = 20 m / 5 m/s = 4 s
ave acceleration = 10 m/s / 4 s = 2.5 m/s^2
... this would be negative to the direction of travel
work done by the braking force equals the initial kinetic energy of the car
f * 20 m = 1/2 * 500 kg * 10 m/s
f = 125 N
average braking velocity = (10 m/s + 0) / 2 = 5 m/s
braking time = 20 m / 5 m/s = 4 s
ave acceleration = 10 m/s / 4 s = 2.5 m/s^2
... this would be negative to the direction of travel
work done by the braking force equals the initial kinetic energy of the car
f * 20 m = 1/2 * 500 kg * 10 m/s
f = 125 N
Answered by
Adeniyi
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