This problem has several different answers on chegg. I need the correct answer explained to me like I am a dumb rock so i can study for my upcoming dynamics test. Problem $1$: $(20$ points$)$ Two smooth disks A and $B$ each have a mass of $0\mathrm{.}5$ kg $.$ If both disks are moving with the velocities shown when they collide, determine their final velocities just after collision. The coefficient of restitution is $e=0\mathrm{.}75.$