InterviewSolution
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InterviewSolution
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12, Acar travelling at 36kn h speeds u to72 k mhin 5 seconds. What İsis acceleration rif the same carstops in 20 seconds, what is the retardation ? |
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Answer» Assuming the acceleration and retardation remain constant in both case. Case I: Initial velocity u=36 km/h=36*1000/3600=10 m/s. Final velocity v=72 km/h=72*1000/3600=20 m/s. v=u+at a=(v-u)/t=(20–10)/5=2 m/s^2 So acceleration = 2 m/s^2 Case II: Initial velocity u =72 km/h= 20 m/s Final velocity v= 0 m/s a=(v-u)/t=(0–20)/20=-1 m/s^2 acceleration= -1 m/s^2 retardation/deceleration= +1 m/s^2 |
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