A car at 36 km/h brakes with a constant deceleration of 5 m/s squared. How far does it travel while braking to a stop?
Answer and explanation
Correct answer: D. 10 m
- Step 1: Speed = 36 / 3.6 = 10 m/s. Use d = v squared / (2a). Step 2. d = 10 squared / (2 x 5) = 10 m. Answer: 10 m. Why not the others: 20 m: 20 m forgets the factor 2 in v squared over 2a. 2 m: 2 m is the braking time in seconds, not a distance. 30 m: 30 m mixes in one second of extra travel.
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