Question

Find the initial velocity of the train which is stopped in 20 seconds by applying brakes the retardation due to brakes is 1.5 metre per second
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Answer 1

⭐Hello Ma'am

⭐Here is Your Answer

⭐KINEMATICS

⭐Applying the First equation of the motion , we are given as ,

⭐Final velocity V = 0 , a = -1.5 m/s^2 , t = 20 sec

⭐so we get as ,

⭐V = U + at

⭐0 = U - 30

⭐U = 30 m/s

⚓so the Initial Velocity of the train is 30 m/s

Answer 2

Solution :-

Given,

V = 0m/s
T= 20 s
a= -1.5 m second square.

Negative sign shows retardation.

Using,
$v = u + at$
We get,

$0 = u + ( - 1.5) \times 20 \\ \\ 0 = u - 30 \\ \\ u = 30 \: m \: per \: second$

Hence, the initial velocity of the train is 30m/s.