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Q.

A car is moving with speed of 150 km/h and after applying the brake it will move 27 m before it stops. If the same car is moving with a speed of one third of the reported speed, then it will stop after travelling ________ m distance.

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answer is 3.

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Detailed Solution

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Stopping distance $= \frac{v^{2}}{2 a} = d$

If speed is made one third

$d^{'} = \frac{1}{9} d . d^{'} = \frac{27}{9} = 3$

Braking acceleration remains same.

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A car is moving with speed of 150 km/h and after applying the brake it will move 27 m before it stops. If the same car is moving with a speed of one third of the reported speed, then it will stop after travelling ________ m distance.