A box is pushed across a horizontal table by a boy applying a force of 32 N to the box. A force of friction of magnitude 19 N acts opposite the direction of motion. A stiff wind also opposes the box's motion. What force does the box exert on the boy's hand?
A) 13 N
B) 32 N
C) 51 N
D) Without knowing the force the wind applies, the question cannot be answered.

Question

Quizplus · Accepted Answer

According to Newton's third law, the box exerts an equal and opposite force on the boy's hand. Therefore, the force exerted by the box on the boy's hand is also 32 N.

A Box Is Pushed Across a Horizontal Table by a Boy