A 0.20 kilogram hockey puck is sliding on a frictionless ice surface with a velocity of 14 m/s toward the east just before making contact with a hockey stick. Take east to be the +x direction. Determine what change in momentum, including sign, does the puck undergo while in contact with the stick if just afterward the velocity of the puck is
(a) 22 m/s toward the east,
(b) 5.6 m/s toward the east, and
(c) 12 m/s toward the west?