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This isn't an homework question. I am trying to understand a solved example in my book. I have attached the solved example.

I am stuck at the point when it says that the instantaneous length of the spring is ##r_a-r_b-l=r_a'-r_b'-l##. I can't figure out how the author got the RHS of the equation. Shouldn't it be ##r_a'+r_b'-l##?

Any help is appreciated. Thanks!

I am stuck at the point when it says that the instantaneous length of the spring is ##r_a-r_b-l=r_a'-r_b'-l##. I can't figure out how the author got the RHS of the equation. Shouldn't it be ##r_a'+r_b'-l##?

Any help is appreciated. Thanks!

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