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Discussion and hints
The four-step solution procedure:
- Step 1 - FBDs: Draw individual free body diagrams (FBDs) for A and B, along with an FBD of A+B. Since you have two impacts occurring at the same time, identify the "n" direction for each impact (they are different for each impact).
- Step 2 - LIM and COR
- For the impact of A with the bumper, use the coefficient of restitution (COR) equation.
- For the impact of A with B, use conservation of linear momentum in the n-direction and the COR equation in the n-direction.
- Step 3 - Kinematics: None needed.
- Step 4 - Solve