A block of mass 22 kg is sliding along the ice at a constant speed 5.0 m/s. just ahead of it is a block of mass 29 kg sliding in the same direction at constant speed 4.6 m/s. when the two blocks collide, the 29-kg block travels at a new speed of 7.2 m/s. what is the new speed of the 22-kg block?

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?