Question

a moving train is brought to rest within 15 seconds by applying brakes find the distance travelled by train at the retardation due to brakes is 3 M per second square

Answer 1

We know:-
Rate of change in speed is called acceleration whether the object is slowing down or speeding up.
So,
Consider the train,then-

-------->------------>---------->-----
Train in. < 15 seconds > Train at
motion. rest

and it's acceleration was -3m/s^2 or -3m/s/s
So distance travelled by train at the retardation due to brakes = 15/3 = 5m ANS.

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