Rachel is helping her younger brother replace a broken part in his toy ambulance. This part is responsible for converting electric energy into light energy. Which of these devices should they use for the replacement?

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.