JEE Main Physics question
A passenger is travelling in a train moving at 72 kmh⁻¹. His suitcase is kept on the berth. The driver of the train applies brakes such that the speed of the train decreases at a constant rate of 36 kmh⁻¹ in 5 s. What should be the minimum coefficient of friction between the suitcase and the berth if the suitcase does not slide during the retardation of the train?
Answer: (A)
Solution
Deceleration = Δv/t = (20−10)/5 = 2 ms⁻² (using 72 km/h=20 m/s, 36 km/h=10
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