A bus is moving with a velocity of 72kmphr .on seeing the red signal of traffic at 27m ahead on the road ,the driver applied brakes and the bus stopped at distance of 25 meter.Calculate the time taken by the car to come at rest.
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Answer:
u=72 km/h 72000/3600=20m/s
s=25m
v=0
Explanation:
using third law of motion =v square -u square =2as
0 square -20 square =2a*25
400=50a
50a= 400
a=400/50
a=8m/s square
so using the formula of acceleration
a=v-u/t
8=o-20/t
8t=20
t=20/8
t=2.5s
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