Physics Collisions Level: Misc Level

A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object.After the collsion the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0 -kg object. Determine the speed of the 2.0-kg object before the collision.

a.15 m/s

b.7.0 m/s

c.8.0 m/s

d.23 m/s

e.11 m/s