Question

A retarding force is applied to stop a train. The train stops after 80 m. If the speed is doubled, then the distance travelled when same retarding force is applied is

A
The same
B
Doubled
C
Halved
D
Four times

Solution

The correct option is C Four timesThe stopping distance is given as , $$s=\dfrac{v^2}{2a}$$. So stopping distance becomes four times if the initial velocity is doubled.Physics

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