Disks A and B have masses { M }_{ A } and { M }_{ B } respectively. If they have the velocities shown, determine their velocities just after direct central impact. Given: { M }_{ A } = 2 kg , { v }_{ A1 } = 2 m/s , { M }_{ B } = 4 kg , { v }_{ B1 } = 5 m/s , e = 0.4