A car moving with a speed of 40 km h⁻¹ can be stopped after 2 m by applying brakes. If the same car is moving with a speed of 80 km h⁻¹, what is the minimum stopping distance?
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A car moving with a speed of 40 km h⁻¹ can be stopped after 2 m by applying brakes. If the same car is moving with a speed of 80 km h⁻¹, what is the minimum stopping distance?

G1 Physics · Accepted Answer

Step 1: For the same braking deceleration, stopping distance follows v²=u²−2as with final v=0, so s∝u². Step 2: Doubling speed from 40 to 80 km h⁻¹ multiplies stopping distance by 4. Step 3: New distance =4×2=8 m. Final answer: A.