Question

a train is moving with avelocity of 90 km/h it is brought to stop by applying brakes which produce aretardation of 0.5 m/s2 find the velocity after 10seconds and the time taken by the train to come to rest

Answer 1

#cosmic
See the attachment

Answer 2

Answer:

i) v = 0

a = - 0.5 m/s²

t = ?

u = 90 × 5/18 m/s = 25 m/s

v = u + at

0 = 25 + (- 0.5) t

0= 25 - 0.5t

0.5 t = 25

t = 25 / 0.5

t = 50 s

ii) u = 90 km/h = 90 × 5/18= 25 m/s

a = - 0.5 m /s²

t = 10 s

v = u + at

v = 25 + ( - 0.5) 10

v = 25 - 5 = 20 m/s

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