1. The problem statement, all variables and given/known data Ok so the actual spring is attached to the 30 kg mass and is unstretched at this height off the ground. So if I were to pull the 25 kg mass down the plane 20 cm(assuming no friction on plane), and then let go, what would the velocity of the two masses be when the spring is unstretched again. The spring constant = 200(Light spring) So here is my attempt(kind of), at a solution, I looked at the forces on both the 25 and 30 kg object, Let m1 = 25 kg and m2 = 30 kg m1 ƩFx: T - m1gsin40 = m1a , normal force doesn't matter for this question m2 ƩFy: m2g + kx - T = m2a Ok now that I have done that I also did the energy on m2 since there is not enough information for energy on m1. m2 Let h1 be 0.4m Let h2 be 0.2m Ei = Ef (0.5)k*x^2 + m2*g*h1 = m2*g*h2 + (0.5)m2*v^2 100*x^2 + 58.8 = 15*v^2 After this I do not know what to do.