Question

a moving train is brought to rest within 20 seconds by applying brakes find the initial velocity if the retardation due to break is 2 metres per second square​

Answer 1

Initial Velocity,= u

Final velocity = v

Retardation = a

Time = t

u=?

v=0m/s

t=20s

a=2m/s^2

Putting 1st equation of motion

[ v=u+at ]

0=u+2 x 20

0=u+40

u=-40

Hope it's help you

Please mark me brainliest