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Download 1 Answer on Question #43438, Physics, Other To stop a 1000
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1 Answer on Question #43438, Physics, Other To stop a 1000-kg car, travelling at 65 km/h. If the braking distance is 35 meters, how much force is necessary to stop the car Solution First we find the braking time. From equations for velocity and distance: v = v0 − atb s = v0 tb − at2b /2 where v0 = 65km/h ≈ 18m/s and s = 35m Braking time is tb = 2s 2 · 35 = ≈ 3.89 s v0 18 So we have to change momentum of car to zero in tb = 3.89 s. Hence, we need force p mv0 1000 · 18m/s ≈ 4627.25 N F = = = tb tb 3.89
