In three situations, a briefly applied horizontal force changes the velocity of a hockey puck that slides over frictionless ice. The overhead views of the figure indicate, for each situation, the puck's initial speed vi, its final speed v, and the directions of the corresponding velocity vectors. Rank the situations according to the work done on the puck by the applied force, most positive first and most negative last. DVS = 4m/s Aw = 5 m/s v; =4 m/s - x X X Av; =6 m/s ; = 2 m/s = 3 m/s (a) (b) (c) O a > b > c O b > a > c O c > b > a O a > c > b O b > c > a O c > a>bCurrent Attempt in Progress A proton (mass m = 1.67 X 10'27 kg) is being accelerated along a straight line at 3.80 x 1013 m/s2 in a machine. If the proton has an initial speed of 8.60 x 106 m/s and travels 2.00 cm, what then is (a) its speed and (b) the increase in its kinetic energy? (a) Number a Units V (b) Number I Units V