An automobiles travelling at $50 \mathrm{~km} / \mathrm{h}$, can be stopped at distance of 40 m by a

Question

An automobiles travelling at $50 \mathrm{~km} / \mathrm{h}$, can be stopped at distance of 40 m by applying brakes. If the same automobiles is travelling at $100 \mathrm{~km} / \mathrm{h}$, all other conditions remaining same and assuming no skidding, the minimum stopping distance in metres is\

Professor PC Thomas Classes · Answer

stopping distance, $d_{s}=-\frac{u^{2}}{2 a}$ Where u is the initial velocity of the car\ For the same deceleration\ $\frac{\mathrm{d}_{\mathrm{s}_{1}}}{\mathrm{~d}_{\mathrm{s}_{2}}}=\frac{\mathrm{u}_{1}^{2}}{\mathrm{u}_{2}^{2}}=$