A ¼kg clay ball rolling E at 10.7m/s collides with a 7/8kg croquet ball on a smooth(almost) friction less surface with this larger ball rolling 10 degrees N of W at 6.3 m/s. Find the resultant velocity and direction and the distance they travel after becoming stuck together if they continue moving for 3.15s

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?