Answer:
45 W
Step-by-step explanation:
First of all, we need to find the work done by the person to lift the bag. The work done is given by

where
F = 75.0 N is the force applied
d = 1.50 m is the displacement of the bag
Substituting numbers into the formula,

Now we can find the power used, which is given by

where
t = 2.50 s is the time taken
Again, using W=112.5 J, we find
