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| 2017/01/21 18:13:28瀏覽52｜回應0｜推薦0 | |
此文章來自奇摩知識+如有不便請留言告知 標題: f.4 phys,,,mechanics,, 發問: Calculate the thinking distance, braking distance and hence the stopping distance of a car travelling at 100kmh^-1, assuming an average reaction time of 0.7s and a uniform decelaration of 5ms^-2. 最佳解答: Initial velocity, u = 100 kmh-1 = 27.78 ms-1 Acceleration, a = -5 ms-2 Final velocity, v = 0 a. For the thinking distance, the car is moving at uniform velocity Thinking distance, d = ut = (27.78)(0.7) = 19.44 m b. By v2 = u2 + 2as 0 = (27.78)2 + 2(-5)s Braking distance, s = 77.16 m Stopping distance = d + s = 19.44 + 77.16 = 96.60 m 其他解答:6A560DB67A298191 |
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