Question

a train is moving with an initial velocity of 30 metre per second the brakes are applied so as to produce a uniform acceleration of -1.5 metre second square calculate the time in which it will come to rest​

Answer 1

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initial velocity = 30 m/s

final velocity = 0

(since due to the retardation it will come at rest at a certain time)

time = t (since we have to find time we take it as 't')

acceleration = -1.5 or retardation

by the formula

$\frac{v - u}{t} = a$

$v - u = at$

$0 - 30 = -1.5t$

$\frac{-30}{1.5} = t$

$20 = t$

so total time taken is 20 sec.

Answer 2

Answer:

initial velocity (u) =30 m/s

final velocity (v) = 0 m/s

acceleration (a) = -1.5 m/s square

v-u =at

0-30= -1.5t

t= -30/1.5

t = 20

Explanation:

so this is your answer: 20s

20 (s) = 20 second