1. The problem statement, all variables and given/known data A 10.6 kg weather rocket generates a thrust of 226.0 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 402.0 N/m, is anchored to the ground. Initially, before the engne is ignited, the rocket sits at rest on top of the spring. A: After the engine is ignited, what is the rocket's speed when the spring has stretched 19.4 cm past its natural length? B: What would be the rocket's speed after travelling the distance if it weren't tied down to the spring? 2. Relevant equations Es=0.5kx^2 Ek=0.5mv^2 Eg=mgy 3. The attempt at a solution For A: I tried making a conservation of energy equation: Es=Ek+Eg v=square root of ((kx^2 - 2mgy)/m) That didn't work, since I don't know y (x=0.2584 m as per another part of the question). Do I need to take the thrust force into account? I didn't even know where to start for B after getting stuck on A.