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A string of mass m and length l is hanging from ceiling as shown in the figure. Wave in string move upward. `v_A`, and `v_B`, are the speed of wave at A and B respectively. Then `v_B` is
A. |
`sqrt3v_A` |
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B. |
`v_A` |
C. |
`<v_A` |
D. |
`sqrt2v_A` |