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# ICSE Class 9 Answered

when brakes are applied to a bus, the retardation produced is 25 cm s^-2 and the bus takes 20 second to stop calculate the initial velocity of the bus and the distance travelled by bus during this time
Asked by aniketkush981 | 20 Sep, 2020, 03:36: PM
Expert Answer
a = 25 cm/s2
v = 0
t = 20 s
v = u + at
0 = u + (-25) x (20)
u = 500 cm/s
Initial velocity, u = 500 cm/s

s = ut + (1/2) at2
s = (500) (20) + (1/2)  (-25) (20)2
s = 10000 + (-5000)
s = 5000 cm = 50 metres
Distance travelled by bus after applying brakes is 50 metres.
Answered by Shiwani Sawant | 21 Sep, 2020, 12:38: PM

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