Question

A truck running at 90 kilometre per hour is brought to rest over a distance of
25 metre calculate the retardation and time for which the brakes are applied

Answer 1

Answer:

Given -

u = 90km/h

= 90×5/18

= 25 m/s

v = 0m/s

s = 25 m

a =?

t =?

v ^2 = u ^2 + 2as

0^2 = 25^2 + 2×a × 25

0 = 625 +50 a

-625=50 a

a = -625/50

a = -12.5 m/s^2

v = u + at

0 = 25 + 12.5 ×t

-25 = 12.5 ×t

t=- 25 /12.5

t = 2sec

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Answer 2

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