Idon’t get how this diagram is set up or the questions. can someone explain the diagram and where each letter goes to.

Identify two factors that determine the rate of stream erosion

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.

How can you measure the amplitude of a longitudinal wave?