Question

A moving train is brought to rest within 20 seconds by applying brakes. Find the initial velocity if the retardation due to brakes is 2m/s2.

Answer 1

Answer:

Its initial velocity will be 40 m/s

Explanation:

you just need is the formula which is :- v-u/t

where v is final velocity

u is initial velocity

a is accelaration

and t is time

now just put the value in formula and put initial velocity = ?

and then put acceleration equal to -2

now just go ahead and solve it like this

-2 = 0 - ?/ 20

-2 × 20 = 0-?

-40 -0= -?

-40 = -?

? = 40

Hence the initial velocity will be 40m/s