Vector A S is 2.80 cm long and is 60.0° above the x-axis in the first quadrant. Vector B S is 1.90 cm long and is 60.0° below the x-axis in the fourth quadrant (Fig. E1.35). Use components to find the magnitude and direction of (a) A S + B S ; (b) A S − B S ; (c) B S − A S . In each case, sketch the vector addition or subtraction and show that your numerical answers are in qualitative agreement with your sketch

the answer is b ) square root of 5

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )