Physics - Rotation Question with Solution | TestHub

A cube of mass m slides without friction at speed ${\mathrm{v}}_0=10\mathrm{m}/\mathrm{s}$. It undergoes a perfectly elastic collision with the bottom tip of a rod of length d and mass $\mathrm{M}=2\mathrm{m}$. The rod is pivoted about a frictionless axle through its center, and initially it hangs straight, down and is at rest. What is the cube's velocity ( In m/s ) after collision.