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NCERT Exemplar Solutions Class 9 Science Solutions for Work and Energy - Exercise in Chapter 11 - Work and Energy
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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
Answer:
(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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