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An automobile travelling with a speed of 60 km/h, can brake to stop within a distance of 20 m. If the car is going twice as fast, i.e., 120 km/h, the stopping distance will be

Asked in AIEEE 2004 · Stopping and retardation

• (1) 20 m
• (2) 40 m
• (3) 60 m
• (4) 80 m

Step-by-step solution

Why the other options are wrong

• (1) Assumes the stopping distance does not depend on the speed.
• (2) Doubles the distance, as if s ∝ v.
• (3) No single slip gives 60 m; s ∝ v² quadruples it.

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