Question

A train starting from a railway station attains a velocity of 20 m/s in 5 second. a) Does the train have acceleration or retardation? b) Find it.​

Answer 1

Answer:

Acceleration

Explanation:

Because, if final velocity is more than initial velocity, it is Acceleration.

Proof:

    Acceleration= change in velocity by time

          ,,              = final velocity - initial velocity / time

          ,,              = $20-0/5$

          ,,              = 20/5 =    4 m/s²

                                       

Note : As train is starting from rest, initial velocity=0