Apply Newton's 2nd Law to write the equations for M1 and M2. You should get two equations with Tension in the string, weight for each mass m accelerations for each mass (a1 and a2); in variable form. Pre-Lab Question 3 results in two equations with three unknowns. A third equation is required to solve the system. Formulate the third equation. (Hint: think about how the two accelerations relate to one another)