Question

a train starts from rest and accelerates uniformly for 20 seconds to attend a velocity of 90 km per hour find the acceleration​

Answer 1

Answer:

a= (v-u /t)

Explanation:

Here u=0

v=90

T= 20sec

a =(90-0/20)

= 90/20

= 9/2

=4.5 m/s

so that a= 4.5 m/s

I think it may be helpful for you

Thank you

Answer 2

Answer:

start from rest so u=0

time taken 20 s

velocity =90 km/hrs

90×5/18=25m/s

a=v-u/the

25-0/20

25/20

5/4