TS. A caris moving with the velocity of 54 km/hr on the road and suddenly a boy come to the
road so the car driver apply brakes calculate how much displacement will it cover after
applying brakes if the car stops in 1.5 seconds?
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Answer:
11.25 m
Explanation:
u = 54 km/hr = 15m/sec
v = 0 km/hr =0m/sec
t = 1.5 s
By first equation of motion,
v = u-at
0 = 15 - a(1.5)
a = 15/1.5 = 10 m/s²
retardation is 10m/s²
by third equation of motion,
v² = u²-2as
0 = 15²-2x10xs
s= 225/20 =11.25 m
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