# NCERT Exemplar Solutions Class 9 Science Solutions for Work and Energy - Exercise in Chapter 11 - Work and Energy

Question 5 Work and Energy - Exercise

A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a leveled road. The work done against the gravitational force will be (g =10 m s–2)

(a) 6 ×103 J

(b) 6 J

(c) 0.6 J

(d) zero

(d) zero

Explanation:

Here Direction of work done is perpendicular to gravitational force direction. Hence the work done against gravity is zero.

Video transcript
"hello everyone welcome to leader learning i am good pray to your science tutor today's question is a girl is carrying a school bag of 3 kg mass on her back and moves 200 meters on a leveled road the work done against the gravitational force will be a 6 into 10 to the power 3 joules b 6 6 joules and c 0.6 joules and d 0 so here we have to find out the work done against the gravitational force and the four options have been given from the four options the correct option will be what let us calculate here the direction of work done is perpendicular to gravitational force okay so the work done against gravity will be zero this makes the correct option as option d that is zero for more such videos please subscribe leader learning and for any doubts drop a comment thank you"
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