3.  Two horizontal forces,  and , are acting on a box, but only  is shown in the drawing.   can point either to the right or to the left. The box moves only along the x axis. There is no friction between the box and the surface. Suppose that   and the mass of the box is 3.0 kg. Find the magnitude and direction of  when the acceleration of the box is (a) +5.0 m/s2, (b) -5.0 m/s2, and (c) 0 m/s2.

All directions are in + or - , so if , or if

 

 

 

 

 

 

 

 

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This page last updated on January 11, 2020