A student is standing at a distance of 50 metres from the bus. As soon as the bus begins its motion with an acceleration of 1ms–2, the student starts running towards the bus with a uniform velocity u. Assuming the motion to be along a straight road, the minimum value of u, so that the student is able to catch the bus is 

(1) 5 ms–1

(2) 8 ms–1

(3) 10 ms–1

(4) 12 ms–1

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