Question

Marisa does 3.2J of work to lower the window shade in

Answer 1

Work is considered as the Force performed on a body to move it a certain distance, that is

W = Fd

Here

W = Work

F = Force

d = Distance

In this case we have the values of work and distance, therefore clearing for the Force we would have to

$F = \frac{W}{d}$

Replacing,

$F = \frac{3.2J}{8m}$

$F = 0.4N$

Therefore the force that Marissa must exert on the windows shade is 0.4N