I need help with questions 3 and 4

please come up with your own answer otherwise I get a 0

5:21 PM Fri Mar 31 '5' 270/03;" 3. Apply Newton's 2\"d Law to write the equations for M1 and M2. You should get two equations with Tension in the string, weight for each mass and accelerations for each mass (a1 and a). Click here to enter text. 4. This results in two equations with three unknowns! A third equation is required to solve the system. What is the third equation? (Hint: What is the relationship between a and a2?) Click here to enter text. EXPERIMENT 1: NEWTON'S FIRST LAW OF MOTION 28% 5:21 PM Fri Mar 31 $3.amazonaws.com Use the free body diagram of the pulley (Figure 4) to answer the Pulley M, > M, Ascending Mass, M, Descending Mass, M, F, = M,g F, =Mg Figure 4: Free Body Diagram: 2 objects with mass hanging on a pulley by string