9) A 2.0 kg block is released from rest at the top of a 20.0 frictionless incline at a height of .650 m. At the bottom of the incline it collides and...

9) A 2.0 kg block is released from rest at the top of a 20.0˚ frictionless incline at a height of .650 m. At the bottom of the incline it collides and sticks to a block of mass 3.5 kg. The two blocks stick together and travel .57 m before coming to rest. What is the coefficient of friction of the horizontal surface along which the two blocks slide together?