An object of mass $2m$, moving through deep space with velocity $v$, breaks apart into two fragments of equal mass, with one fragment coming to rest. What is the kinetic energy of the fragment that is moving after the break-up?
- A$\frac{1}{2}mv^2$
- B$mv^2$
- C$\frac{3}{2}mv^2$
- D$2mv^2$