D. When Alan's puck is moving at 21 m/s south, it collides with an ice skate of mass 2 kg sitting on the rink. Alan's
puck bounces backward at a speed of 4 m/s. What is the
momentum of the puck-skate system before the collision?

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?