A box (m1=1.2 kg) is being pulled up an (not necessarily frictionless) incline by another mass (m2=0.85 kg), which is descending straight down. The two objects are attached by a string. They are released from rest. After moving downward for 1.50 m, m2 hasa speed of 2.0 m/s. The plane is inclined by an angle of 25 degrees.
A. How much energy did the hanging mass lose?
B. How much energy did the box gain? This is not the same answer as part A. Why?
C. How much work is done by friction in this system?