Hi, i need help on this problem: A brass spring (with spring constant k) with no mass on it hangs vertically from fixed support bar, at rest. You attach a mass m to the free end and release it; how far does the mass drop before the spring brings it to a (brief) stop and it starts to bounce back: Use conservation of energy, and show your work. Solve for your answer in terms of k, m, and g. Ignore mass of the spring itself. 2) Your spring stretches more than 50 cm from its rest position, it will become permanently bent out of shape. What is the largest mass ( to 2 significant figures) that you would dare to use for your dropping experiment in part (a)? Assume the same value for k.