Question

The same retarding force is applied to stop a train. The train stops after 80 m. If the speed is doubled, then the distance will be

• A. The same
• B. Doubled
• C. Halved
• D. Four times

Answer 1

Answer: (D)

Four times

Answer 2

Stopping distance $S \propto u ^ { 2 }$ . If the speed is doubled then the stopping distance will be four times.