**A block is being pulled by two ropes. One with a tension of 9N and the other with a tension of 3N. It accelerates at a rate of 0.56m/s^2. What is the mass?**

**Answer:**

Assuming the ropes are pulling in the same direction you add the forces and use the F = ma equation

3 + 9 = m * 0.56

m = 21.429 kg