A large 5-kg marble moves at a speed of 20 m/s. It collides with a second marble whose mass is 10-kg, moving at
10 m/s in the same direction. After the collision, the 5-kg marble continues with a speed of 8 m/s in the same direction.
(A) What is the speed of the 10-kg marble?
(B) What is the initial and final kinetic energies of the system?
(C) Is the collision inelastic or elastic?
