1. A 66.3 g mass is attached to the end of an unstressed vertical spring (of constant 63.5 Nm) and then dropped. The acceleration of gravity is 9.8 m/s2 : What is its maximum speed? Answer in units of m/s. Im not quite sure that I understand what this problem is saying. Is the block hanging from the spring? Is it on top of the spring? Im not sure how this system is setup, but beyond that it is a harmonic motion problem, correct? 2.A(n) 1.6 kg object moving at a speed of 6.5 m/s strikes a(n) 1.2 kg object initially at rest. Immediately after the collision, the 1.6 kg object has a velocity of 0.88 m/s di- rected 46 degrees from its initial line of motion. What is the speed of the 1.2 kg object immediately after the collision? Answer in units of m/s. Ive been doing it like this: X direction: m1i*v1i=m1i*v1f*cos(46) + m2*v2f*cos(46) Y direction: m1*v1i=m1*v1f*sin(46) + m2*v2f*sin(46) and then v2f= sqrt(x^2 + y^2) However this is apparently wrong, am I close in my approach to this problem?