A spring is stretched 10cm by a force of 3 N. A Mass of 2kg is hung from the spring and attached to a damper which exerts 3 N when the velocity = 5m/sec. There's more but I just need a little help setting it up. I don't understand how to find y (as in yu'(t)). Unless its just 3/5. Just a few hints would suffice, I'm not asking you to solve these. Thanks, Sean Also, I'm sorry I also posted this in the physics homework area. oopsies.