Answer
0.84 meters.
Work Step by Step
The particle travels a distance of four times the amplitude:
from equilibrium (0) to +A,
from +A back to zero,
then from zero to -A,
and then from -A back to zero.
4(0.21m) = 0.84 m.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.