question_answer

A child pushes a toy box 4.0 m along the floor by means of a force of 6 N directed downward at an angle of \[37{}^\circ \] to the horizontal. How much work does the child do?

A)  18.0 J                        

B)  19.2 J

C)  14.4 J                        

D)  None of these

Correct Answer: B

Solution :

Work =Fs cos \[37{}^\circ \]     = (6) (4) (0.80) = 19.2 J