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## Homework Statement

A figure shows two blocks connected by a cord that passes over a frictionless pulley. The arrangement is known as Atwood's machine. Block 1 has mass m1 = 1.30 kg; block 2 has mass m2 = 2.80 kg.

Sorry, no picture.

What is the magnitude of the acceleration of the blocks?

## Homework Equations

T = 1.3a + 12.7 N

T = -2.8a + 27.4 N

## The Attempt at a Solution

The answer is 3.58 m/s^2 but why and how?