Answer
a) and b) Yes, work is being done in both cases. It does not matter in what way the work is being done, it depends on the initial and final positions.
c) No work is done, as there is no movement or change in speed.
d) Yes, work is done on the bar-bell by gravity.
Work Step by Step
a) and b) Yes, work is being done in both cases. It does not matter in what way the work is being done, it depends on the initial and final positions.
c) No work is done, as there is no movement or change in speed.
d) Yes, work is done on the bar-bell by gravity.
