A train moving with a velocity of 20 m s-¹ is brought to rest by applying brakes in 5s. Calculate the retardation.

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Solution

Initial velocity (u) = 20ms^-1

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

time (t) = 5s

Retardation = (u-v)/t

= (20-0) /5

= 20/5

therefore retardation = 4ms^-2

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A train moving with a velocity of 20 m s-¹ is brought to rest by applying brakes in 5s. Calculate the retardation.

Initial velocity (u) = 20ms^-1 Final velocity (v) = 0 (since comes to rest ) time (t) = 5s Retardation = (u-v)/t = (20-0) /5 = 20/5 therefore retardation = 4ms^-2

Initial velocity (u) = 20ms^-1

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

time (t) = 5s

Retardation = (u-v)/t

= (20-0) /5

= 20/5

therefore retardation = 4ms^-2