Answer:
15,000 J
Step-by-step explanation:
Since the lift also carries the man, the total weight of the man+lift system is
[tex]F=300 N + 950 N = 1250 N[/tex]
The work done in moving the lift upward is
[tex]W=Fd[/tex]
where
F is the weight of the lift+man combined system
d is the displacement
In this problem,
F = 1250 N
d = 12 m
Substituting,
[tex]W=(1250)(12)=15,000 J[/tex]
