An Atwood machine is constructed using two wheels (with the masses concentrated at the rims). The left wheel has a mass of 2.1 kg and radius 21.69 cm. The right wheel has a mass of 2.6 kg and radius 28.73 cm. The hanging mass on the left is 1.67 kg and on the right 1.09 kg. 3. m MA m3 What is the acceleration of the hanging mass on the left? Use down as the posi- tive direction. The acceleration of gravity is 9.8 m/s. Answer in units of m/s. Answer in units of m/s. Yo