Respuesta :
34.77 Joules of work is done on the backpack.
How work-done is calculated?
Work-done on any body can be calculated as:
W = F × x, where
F = force
x = displacement or distance
In the question, given that
Force to lift a backpack = 53.5 N
And distance = 0.65 m
Now work-done is calculated as:
W = 53.5 × 0.65 = 34.77 Joules
Hence, 34.77J of work is done.
To learn more about work-done, visit the below link:
https://brainly.com/question/26369337