Topic: Engineering Mechanics
A car moving with speed u can be stopped in minimum distance x when brakes are applied. If the speed becomes n times, the minimum distance over which the car can be stopped would take the value
- A. x / n
- B. n * x
- C. x / n²
- D. n² * x
Answer: D. n² * x
Explanation: Using v² - u² = 2as, stopping distance x = u² / 2a. If speed becomes nu, the new distance s = (nu)^2 / 2a = n² * (u² / 2a) = n² * x.