## A moving train is brought to rest within 20 seconds by applying brakes. find the initial velocity, if the retardation due to brake

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 2 m s–²

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Mathematics
1 year
2021-07-27T22:53:16+00:00
2021-07-27T22:53:16+00:00 2 Answers
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## Answers ( )

Understanding the question:This question says that we have to find out the initial velocity if a moving train is brought to rest within 20 seconds by applying brakes. And the retardation due to brakes is Let’s do it!Giventhat:Don’tbeconfused!• Final velocity came as zero because moving train is brought to rest.

• Acceleration came in negative beacuse the train retards.

Tocalculate:Solution:Usingconcept:Usingformula:Where,

vdenotes final velocity ,udenotes initial velocity ,adenotes acceleration andtdenotes time.FullSolution:→ v = u + at

→ 0 = u + (-2)(20)

→ 0 = u + (-40)

→ 0 = u – 40

→ 0 + 40 = u

→ 40 = u

→ u = 40 m/s

→ Initial velocity = 40 m/s

Answer:Pleasemarkasbrainliest...Step-by-step explanation:## v = u + at

## 0 = u + (-2)(20)

## 0 = u + (-40)

## 0 = u – 40

## 0 + 40 = u

## 40 = u

## u = 40 m/s

## Initial velocity = 40 m/s