Question

A train moving with a velocity of 20 m s' is brought
to rest by applying brakes in 5 s. Calculate the retardation​

Answer 1

Answer:

HOLA!!

HERE WE GO

GIVEN

Initial velocity (u) = 20ms^-1

Final velocity (v) = 0 (since comes to rest )

time (t) = 5s

SOLUTION

Retardation = (u-v)/t

= (20-0) /5

= 20/5

therefore retardation = 4ms^-1

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Step-by-step explanation:

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Answer 2

Answer:

From the given condition

Initial Velocity = u = 20 m/s

Final Velocity = v = 0

Time = t = 5 sec

Let retardation = f =?

We know that

V = u - ft

0 = 20 - 5f

5f = 20

f = 4

So the required retardation = 4 m/s²