1. The problem statement, all variables and given/known data As shown in the figure below, small object A (mass: M) collides with small object B (mass: m), which is initially at rest, on top of a horizontal stand fixed to a horizontal floor. Both A and B proceed to shoot horizontally off the stand and fall to the floor. Horizontal distance D from the edge of the stand to the point where A lands is 1/2 of the horizontal distance d to the point where B lands. Friction between the two objects and the stand is negligible. https://scontent-kul1-1.xx.fbcdn.net/hphotos-xfp1/v/t34.0-12/12767193_1257518357595899_654751098_n.jpg?oh=5ee0294835905cc57ce2d8b8b2eed855&oe=56CC2F3E What is the coefficient of restitution between A and B? 2. Relevant equations 3. The attempt at a solution If I simply substitute M1U1 + M2U2 = M1V1 + M2V2 and the equation above, I will come out with (M - m)/ 2M but that's wrong since I didn't put in the distance factor.. I'm not sure how to bring in the distance factor into the restitution formula. Should I use the v^2 = u^2 + 2as formula? Also, is it that both A and B are in rest when they land on the floor? If that's the case, won't the final velocity of the object be 0?