Ablock of mass m=0.750 kg is fastened to an unstrained horizontal spring whose spring constant is k=82.0 n/m. the block is given a displacement of +0.120m, where the + sign indicates that the displacement is along the +x axis, and then released from rest. c) what is the maximum speed of the block? group of answer choices

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?