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

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6 \times 1 0^{3} J

6 J

0.6 J

Zero

answer is D.

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Detailed Solution

The work done by the girl against the gravitational force is 0 J.
Given
Mass of bag(

m

)

= 3 kg

Horizontal Displacement of girl

(s) = 200 m

Acceleration due to gravity

(g) = 10 m / s^{2}

vertical displacement

(h) = 0

(as the girl is moving on levelled road)
Work done by the girl against gravity

= ?

Work done is given by the potential energy in this system

W = F \times s

= m \times g \times h

\Rightarrow W = 3 \times 10 \times 0

\Rightarrow W = 0 J

.
The vertical displacement of the girl is

0

so the work she will be done against gravity is

0

.
∴The work done by the girl against the gravitational force is

0 J

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