a metric ton bus is running with a velocity of 72 kilometre per hour. On seeing a boy on the ground 65m ahead driver jammed on the brakes. Mention whether the accident (bus hiiting the boy )happened or not with mathematical calculation and assuming that the boy with did not move from his place .if the retarding force is 20000 Newton.
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Answer:
Given
mass of the bus = 1000kg
Retarding force = 20000N
we know that f=ma
acceleration = -20m/s
initial velocity of bus (u) = 72 kmph = 72 (5/18)
= 20 m/s
final velocity of the bus(v) = 0
u + at = 0
20-20t =0
t=1s
displacement (s) = ut + 1/2 at^2
s =20 - 10 =10m
the accident will not happen I. e bus hitting the boy
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