A driver increases speed from 50 km/h to 100 km/h. By what factor does the braking distance change?
Answer and explanation
Correct answer: C. 4
- Step 1: Braking distance is proportional to the square of the speed. Step 2. Factor = (100 ÷ 50)² = 4. Answer: 4. Why not the others: 2 results from having forgotten to square the speed ratio. 8 results from having cubed the speed ratio. 5 results from having added one to the correct factor.
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