A body at rest breaks apart into two fragments with masses $m$ and $2m$. The fragments acquire kinetic energies $X$ and $Y$, in that order. What is the value of the ratio $\frac{X}{Y}$?
- A$\frac{1}{4}$
- B$\frac{1}{2}$
- C$2$
- D$4$
Physics 9702 · AS & A Level · Linear momentum and its conservation