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Q.

A car moving with a speed of 40 kmh-1 can be stopped by applying brakes in 2 m. If the car is
moving with a speed of 80 kmh-1, the minimum stopping distance under similar brakes will be 

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a

8 m

b

2 m

c

4 m

d

6 m

answer is A.

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Detailed Solution

Speed is doubled. Therefore, kinetic energy will become four times. Hence, minimum stopping distance will also become four times, i.e. 4 x 2 m = 8 m.

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A car moving with a speed of 40 kmh-1 can be stopped by applying brakes in 2 m. If the car ismoving with a speed of 80 kmh-1, the minimum stopping distance under similar brakes will be