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17. A bicycle moves with a constant velocity of 5 km/h for 10 minutes and then decelerates at the rate1 km/h”, till it stops. Find the total distance coveredby the bicycle. |
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Answer» Total distance covered by the car = 13.3 kmStep by step explanations :Given that, A bicycle moves with a constant velocity of 5 km/hfor 10 minuteshere, Initial velocity of the bicycle = 5 km/htime taken = 10 miniutes = 10/60 h= 1/6 HWE know that in a constant velocity acceleration is 0so, S = ut + ½ at²S = 5(1/6)S = 5/6 km now BRAKES are applied so final velocity = 0 m/sgiven acceleration = -1 km/h²now we have, Initial velocity(u) = 5 km/hfinal velocity(v) = 0 km/hacceleration(a) = -1 km/hv² = u² + 2as(0)² = 5² + 2(-1)s-2s = -25S = 25/2now total distance covered by the bicycle = 5/6 + 25/2(10 + 150)/12= 160/12= 13.3 km so, Total distance covered by the car = 13.3 km |
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