A bus travelling at 72 kmph is forced to slow down to a velocity of 36 kmph by a traffic policeman. If the bus takes 8 seconds to slow down, calculate its average deceleration.
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Answer:-1.25 m/s^2
Explanation:u=72 km/h =20 m/s
v=36km/h=10m/s
t=8s
a=v-u/t = -10/8
= -1.25m/s^2
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