College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 50

(a) You are told that an object has zero acceleration. Which of the following is true: (1) The object is at rest; (2) the object is moving with constant velocity; (3) either (1) or (2) is possible; or (4) neither 1 nor 2 is possible. (b) Two forces on the object are F 1 = 3.6 N at 74° below the + x -axis and F 2 = 3.6 N at 34° above the x -axis. Is there a third force on the object Why or why not If there is a third force, what is it