A girl carries a school bag of mass on her shoulder and walks along a straight…

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A girl carries a school bag of mass

5\,\text{kg}

on her shoulder and walks

20\,\text{m}

along a straight horizontal road. What is the work done by the gravitational force on the bag? Give a reason for your answer.