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A driver of a car travelling at 54 km/h applies brakes and accelerates uniformly in the opposite direction. The car stops in 5 s. Another driver going at 36 km/h in another car applies his brakes slowly and stops in 10 s. On the same graph paper plot the velocity - time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied? Plot the velocity - time graph --------------- |
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Answer» Car B travelled FARTHER than Car A after the brakes were applied.Explanation: Car Au=54km/h = 15m/sv=0m/ss= AREA under the graph of car A with time axiss=[1/2] X base x height =[1/2] x 5 x 15 =37.5m Car B u= 36km/h = 10m/s v=0m/ss= Area under the graph of car B with time axiss= [1/2] x base x height =[1/2] x 10 x 10 =50m |
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