Question Detail
Question
An object is acted upon by a horizontal force of 15 N. If the opposing frictional force is 8 N and the object moves through a horizontal distance of 7.5 m, calculate the effective work done on the object.
Correct Answer
Option A is the correct answer.
Detailed Explanation
Net force = 15 - 8 = 7 N. Work done = net force × distance = 7 × 7.5 = 52.5 J.
Hint
Effective work is done by the net force, which is the vector sum of all forces.