Question

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

• A. $6\times {10}^{3}J$
• B. $6J$
• C. $0.6J$
• D. $0J$

Answer 1

The correct option is D $0J$

The height of the bag from the ground always remains constant throughout the journey.
$\Rightarrow$$s=0$
$\Rightarrow$$W=F\ast s$
$\Rightarrow$$W=0J$
hence the work done against the gravitational force will be zero.