PART TWO : SOLUTION PROBLEMS Q1. A 6.0-kg object moving with speed of 5.0 m/s in the direction of positive x-axis, collides with and sticks to a 4.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of the motion of the 6.0-kg object. Determine: A - The speed of the 4.0-kg object before the collision? B- The loss of the energy due to the collision