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A driver of a car travelling at 52km/h applies the brakes and accelerates uniformly in the opposite direction. the car stopes in 5s. another driver going at 3km/h in another car applies his brakes slowly and stops in 10s . on the same graph paper, plot the speed versus time graphs for the two cars. which of the two cars travelled farther after the breaks were applied? |
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Answer» tion:(A) : Initial speed of the CAR A u=52 KMH −1 =52× 185 =14.44 ms −1 The car stops in 5 seconds i.e v=0 at t=5(A) : Initial speed of the car A u=3 kmh −1 =3× 185 =0.83 ms −1 The car stops in 10 seconds i.e v=0 at t=10With the help of these initial and FINAL points for both the cases, we can PLOT the graph of speed vs time.Area under the speed-time graph gives the distance covered.∴ Distance covered by car A x A = 21 ×14.44×5=36.1 m∴ Distance covered by car A x B = 21 ×0.83×10=4.15 mThus car A travels more distance than B.solution |
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