106. Block A, with a mass of 4 kg, is moving with a speed of 2.0 m/s while block B, with a mass of 8 kg, is moving in the opposite direction with a speed of 3 m/s. The center of mass of the two block-system is moving with a velocity of:

v = 1⅓ m/s in the direction of the 8 kg block.

Explanation:

As momentum is a vector, we need to handle direction as well as magnitude.

If we assume the 4 kg block is moving in the positive direction.

4(2.0) + 8(-3) = (4 + 8)v

v = -1.33333...

the answer would be   dignified - apex