A car travelling at 110 km/h decelerates for 4.5 seconds to a final velocity of 45 km/h. Calculate the deceleration of the car
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Class 11
>>Physics
>>Motion in a Straight Line
>>Problems on Equation of Motion
>>A car travelling at 72 km/h decelerates
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A car travelling at 72 km/h decelerates uniformly at 2m/s
2
. Calculate (a) the distance it goes before it stops, (b) the time it takes to stop, and (c) the distance it travels during the first and third seconds.
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u
initial
=72×
18
5
=20m/s
a
deceleration
=2m/s
2
(a)s=ut+
2
1
at
2
v=u+at
v=0
u−a
dec
t=0
20=2×t
t=10s
s=20×10−
2
1
×2×100
s=100m
(b)t=10s
(c)s
nth
=u+
2
a
(2n−1)
s
1st
=20−
2
2
(2×1−1)
s
1st
=19m
s
3rd
=20−
2
2
(2×3−1)
s
3rd
=15m
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