Example 6:

Calculate the acceleration of A for each of the two systems. Set F=mg and compare the acceleration of A
in each system.
Solution (a):

_{}
_{}
_{}
(i.e. moves up)
Solution (b):
Kinematics:

Kinematics:
_{}constant
_{}
_{} for A
_{}
_{} for B
_{}
Solve
(1), (2), (3) to get
_{}