A train of mass M stops after travelling a distance of 10m on applying brakes. If more passengers are boarded in the train so that its mass becomes 2 M, at what distance will the train now stop with t

Question

A train of mass M stops after travelling a distance of 10m on applying brakes. If more passengers are boarded in the train so that its mass becomes 2 M, at what distance will the train now stop with the same initial speed on applying brakes ?

TestHub · Accepted Answer

Braking force is friction f = μ M g , so the deceleration is a = μg , independent of mass. d = 2 μg v 2 ​ is the same for mass M and 2 M , so the train stops in 10 m .

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