An object of mass m1=7.3 kg moving at 5.5 m/s strikes a stationary second object of unknown mass. After an elastic collision, the first object is observed moving at 3.3 m/sat an angle of -37° by respect to the original line of motion.
1) What is the mass of the second ball?
2) What is the energy of the second object?
3) What is the magnitude of the second object's momentum after the collision?
4) At what angle did the second ball move relative to the direction of the first ball's initial motion?