Question

a moving train is brought to rest with in 20 second by playing break if the retardation due to break is 2 metre per second ^2 then the initial velocity was

Answer 1

HI FRIEND

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HERE IS YOUR ANSWER :-

GIVEN :

FINAL VELOCITY (v) = 0 m/s

TIME = 20 SECONDS

RETARDATION = 2 m/s^2

THEREFORE :

RETARDATION =
- (ACCELERATION)

2 = - (ACCELERATION)

ACCELERATION = - 2 m/s^2

ACCELERATION = v - u/t

- 2 = 0 - u/20

- 2 × 20 = -u

- u = - 40

u = 40 m/s

THEREFORE, INITIAL VELOCITY (u) = 40 m/s

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HOPE IT HELPS

MARK MY ANSWER BRAINLIEST