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Question

A car moving with a velocity of 10 m/s can be stopped by the application of a constant force F in a distance of 20 m. If the velocity of the car is 30 m/s, it can be stopped by this force in

A
203 m
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B
20 m
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C
60 m
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D
180 m
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Solution

The correct option is D 180 m
Since, the applied force is constant, the retardation produce by it in order to stop the car will be constant.
We have,
v2u2=2as 02u2=2as
su2.
s2s1=u22u21 s220=302102
s2=180 m
Hence, in second condition the car will stop in a distance of
s2=180 m

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