You carry a 7.0-kg bag of groceries 1.2 m above the ground at constant speed across a 2.7 m room. How much work do you do on the bag in the process?

Question

Quizplus · Accepted Answer

Work done is defined as the force applied to an object times the distance over which it's applied in the direction of the force. Since the bag is carried at a constant height and speed, the force you apply (upwards) is equal and opposite to the force of gravity, and there is no displacement in the direction of the force (up or down). The displacement is horizontal, so no work is done against gravity.

You Carry a 7