Question

You carry a 7.0 kg bag of groceries above the level floor at a constant velocity of 75 cm/s across a room that is room. How much work do you do on the bag in the process?

A) 158 J
B) 82 J
C) 134 J
D) 0.0 J

Answer 1

Work done, W = 0

Step-by-step explanation:

It is given that,

Mass of the bag, m = 7 kg

Speed of the person, v = 75 cm/s (constant)

To find,

Work done

Solution,

The product of force and displacement is called work done. It is given by :

`W=Fd\ cos\theta`

`\theta` is the angle between force and displacement

Here, the person carries a bag and moving with constant velocity. It means that the angle between force and displacement is 90 degrees.

`cos(90)=0`

W = 0

So, the work done by the person on the bag in the process is equal to 0. Therefore the correct option is (d).