2. Why is the potential energy of a spring U = 1/2k() - yo) instead of U = 1/2(12 - yo?), when a change in kinetic energy is AK = Vzm(v - V. ) and not 1/2m(v - vo)?? 3. What are possible sources of error in the experiment? (faster wolle) Would it be possible to determine the velocity of the oscillating mass at any point? (Explain.) soulge 's atw have. imot lodon