Question

A train starting from railway station attains a speed of 21m/s in one minute. Find the acceleration.

Answer 1

initial velocity of train = 0
final velocity of train = 21 m/s
time taken = 1minutes = 60 sec

so,

acceleration = change In velocity/time
= ( 21-0)/60 = 21/60 = 7/20 m/s²

Answer 2

As we know,

acceleration = (Final velocity - Initial Velocity)/Time taken

So here,

1 min =60 seconds

Acceleration = (21-0)/60.

= 21/60

=7/20 m/s^2

Hope you understand..

Thank you