In Moldovan driving safety, how does doubling a vehicle's travel speed (e.g., from 50 km/h to 100 km/h) affect its kinetic energy and braking distance?
Answer and explanation
Correct answer: D. Kinetic energy and braking distance increase by four times
- Step 1: Kinetic energy is proportional to the square of velocity (); doubling speed quadruples braking distance. Answer: Kinetic energy and braking distance increase by four times. Why not the others: Kinetic energy grows quadratically, not linearly.
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