1. The problem statement, all variables and given/known data Draw a free body diagram showing all the forces on the elastic band, and a free body diagram showing all the forces on the bag of coins 2. Relevant equations F=-kx F=mg 3. The attempt at a solution I drew the forces on the elastic band as T = mg (m = mass of coins since the elastic band's mass isn't stated) upwards and mg downwards The forces I drew on the bag were F = kx upwards (the force of the elastic's stretch pulling proportionally upwards on the bag) and F = mg downwards (m = mass of coins) If it were a rope attaching the bag to the ceiling I'd be ok but I'm a bit thrown off since it's an elastic band. Please let me know if this seems logical. Thanks in advance for your help!