1. A uniform stick of mass m and length l spins arounds on a frictionless horizontal table, with its CM stationary (but not fixed by a pivot). A mass M is placed on the plane, and the end of the stick collides elastically with it, as shown. What should M be so that after the collision the stick has translational motion, but no rotational motion? 2. This is where I get stuck 3. I'm hindered not only because I don't know which equations to apply, but also, I don't know what would result in the stick having just translational motion.