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Question

A car is moving in a straight line with speed 18km h1. It is stopped in 5s by applying the brakes. Find : (i) the speed of car in ms1. (ii) the retardation and (iii) the speed of car after 2s of applying the brakes.

A
5ms1
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B
1ms1
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C
3ms1
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D
none on these
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Solution

The correct option is A 5ms1
Given, Speed=18km/h,t=5s

a)The speed of the car in m/s=18×518=5 m/s

b) The retardation is:

a=vut=055=1m/s2

c) The velocity of the as a funcition of time 2sis:

v(t)=5tv(t)=52=3m/s=10.8 km/h

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