Solve Newton's 3rd Law Homework: Mass of Block on Left

[mcryder16]

Homework Statement

The 120.8 kg block in FIGURE takes 5.87 s to reach the floor after being released from rest. What is the mass of the block on the left? (h=1.05 m.)

Homework Equations

Any ideas of how to do this problem?

The Attempt at a Solution

 

[Pengwuino]

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