Question

A person is lifting a bag of groceries with a uniform force of 75.0 N upward for 2.50 s. They raised the bag 1.50 m to place on a table from the floor. What power did they use?​

Answer 1

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

`W=Fd`

where

F = 75.0 N is the force applied

d = 1.50 m is the displacement of the bag

Substituting numbers into the formula,

`W=(75.0 N)(1.5 m)=112.5 J`

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

`P=(W)/(t)`

where

t = 2.50 s is the time taken

Again, using W=112.5 J, we find

`P=(112.5 J)/(2.5 s)=45 W`