Rankers Physics
Topic: Kinematics
Subtopic: Equations of Motion

When a car is stopped by applying brakes, it stops after travelling a distance of 80 m. If speed of car is halved and same retarding acceleration is applied then it stops after travelling a distance of
20 m
50 m
75 m
100 m

Solution:

Using the stopping distance formula:

 

su2s \propto u^2

 

If speed is halved, new stopping distance:

 

s2=804=20 ms_2 = \frac{100}{4} = 25 \text{ m}

 

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