Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 4 - Work And Energy

Question 62 Exercise

A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g is 10 m/s2, the work done by the girl against the gravitational force will be:

a) 6000 J

b) 0.6 J

c) 0 J

d) 6 J

Answer:

The correct answer is c) 0 J

Video transcript

"guys welcome to lido q a video i am vinit your leader tutor bringing you this question on your screen a girl is carrying a school bag of 3 kg mass on our back and moves 200 meter on a level row if the value of g is 10 meter per second square the work done by the girl against the gravitational force will be now the girl is not pulling the bag away from the ground it is just moving along the ground right therefore the work done against the gravitational force that is in the opposite direction of the gravitational force is 0 0 because displacement is 0 in the direction opposite to gravitational force right isn't that easy if you still have a doubt please leave a comment below do like the video and subscribe to our channel and see you in our next video until then bye guys keep learning keep flourishing"

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