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Two ice skaters A and B approach each ot...

Two ice skaters A and B approach each other at right angles. Skater A has a mass 30 kg and velocity 1 `"m.s"^(-1)`, skater B has a mass 20 kg and velocity `2"m.s"^(-1)`. They meet and cling together. Find the final velocity (in `"m.s"^(-1)`) of the couple.

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