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Question

A car is moving with a velocity of 90 km/h. The application of brakes offers a constant retardation of 5 m/s2. Find the distance travelled by the car before it comes to rest.

A
50 m
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B
62.5 m
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C
625 m
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D
125 m
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Solution

The correct option is B 62.5 m
Initial speed =90 km/h=25 m/s, acceleration =5 m/s2
Using the third equation of motion,
v2u2=2as
We have, (0)2(25)2=2(5) s
s=62.5 m

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