A simple Atwood’s machine uses a massless
pulley and two masses m1 and m2. Starting
from rest, the speed of the two masses is
8.2 m/s at the end of 2.2 s. At that time, the
kinetic energy of the system is 30 J and each
mass has moved a distance of 9.02 m.
Find the value of heavier mass. The acceleration
due to gravity is 9.81 m/s
2
.
Answer in units of kg.