Question

A train starting from railway station attains a speed of 21m/s in 1minute .Find its acceleration.

Answer 1

Here, a1=0 and  a2= 21m/s

 t1= 0   and  t2= 60 sec

a=(v2-v1)/(t2-t1) =  21/60 ms^-2

=0.35 ms^-2

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Answer 2

Answer:

initial velocity of train = 0

final velocity of train = 21 m/s

time taken = 1minutes = 60 sec

Thus,

acceleration = change In velocity/time

= ( 21-0)/60 = 21/60 = 7/20 m/s²