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The formula for calculating this question,a car of mass 500kg traveling at 36km/h is brought to rest over a distance of 20m calculate the average retardation, and the average braking force
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36km/hr * 1000m/km * 1hr/3600s = 10 m/s
v^2 = 2as, so a = v^2/(2s) = 2.5 m/s^2
F = ma
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