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# How to find amplitude in this m3 question? (shm) watch

1. The example simply stated amplitude = 0.4. Am I missing something?
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2. (Original post by thebrahmabull)
The example simply stated amplitude = 0.4. Am I missing something?
Yes. You're missing the fact that the book is in error.

Eqilibrium position is the midpoint as the two springs are identical. I.e. 2m from A.

Mass is released (zero velocity) from C, 2.5m from A.

Hence aplitude is 2.5-2 = 0.5m.
3. (Original post by ghostwalker)
Yes. You're missing the fact that the book is in error.

Eqilibrium position is the midpoint as the two springs are identical. I.e. 2m from A.

Mass is released (zero velocity) from C, 2.5m from A.

Hence aplitude is 2.5-2 = 0.5m.
Thanks a lot man! I wrote a note saying it was 0.5 as well before. But I forgot how to do this math now that I am revising.

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