Question

a moving train is brought to rest with in 20 seconds by applying brake find the initial velocity of the if the retardation to the brakes is 2m/s²

Answer 1

hey your ans is here

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given

u=?
v=0
a=-2
t=20

a=v-u/t
-2=0-u/20
-40=-u
u=40

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Answer 2

hey mate !!
hope it helps u..✌✌