A car is moving in a straight line with speed 18kmh−1. It is stopped in 5s by applying the brakes. Find : (i) the speed of car in ms−1. (ii) the retardation and (iii) the speed of car after 2s of applying the brakes.
A
5ms−1
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B
1ms−1
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C
3ms−1
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D
none on these
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Solution
The correct option is A5ms−1
Given, Speed=18km/h,t=5s
a)The speed of the car in m/s=18×518=5m/s
b) The retardation is:
a=v−ut=0−55=1m/s2
c) The velocity of the as a funcition of time 2sis: