Question

A car moving with a velocity of 10 m/s can be stopped by the application of a constant force F in a distance of 20 m. If the velocity of the car is 30 m/s, it can be stopped by this force in

• A. $\frac{20}{3}m$
• B. 20 m
• C. 60 m
• D. 180 m

Answer 1

Answer: (D)

180 m

Answer 2

$S \propto u^{2}$. If u becomes 3 times then S will become 9 times i.e. $9 \times 20 = 180m$