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 $g$ be $10\ m/s^2$, the work done by the girl against the gravitational force will be:
(a) $6000\ J$
(b) $0.6\ J$
(c) $0\ J$
(d) $6\ J$

Here given, mass of the bag $m=3\ kg$

Horizontal displacement $=200\ m$

Gravitational acceleration $g=10\ ms^{-2}$

Here vertical displacement $h=0$

Therefore, work done against gravity $=mgh$

$=3\times10\times0$

$=0\ J$

Therefore, option (c) is correct.

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Updated on: 10-Oct-2022

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