A ring and disc of same mass rolling on a level surface have kinetic energy is 20 J and 15J. The rad

Question

A ring and disc of same mass rolling on a level surface have kinetic energy is 20 J and 15J. The radio between their speeds will be\

Professor PC Thomas Classes · Answer

Let $\mathrm{E}_{1}$ and $\mathrm{E}_{2}$ be the KE of ring and disc\ $\frac{\mathrm{E}_{1}}{\mathrm{E}_{2}}=\frac{\mathrm{mv}_{1}^{2}}{\frac{3}{4} \mathrm{mv}_{2}^{2}}=\frac{20}{15}$\ $\left(\frac{\mathrm{v}_{1}}{\mathrm{v}_{2}}ight)^{2}=\frac{20}{15} 	imes \frac{3}{4}=1: 1$