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a 6 kg mass with an initial velocity of 7 i m/s collides and sticks to a 5 kg mass with an initial velocity of v j m/s. the direction of the final velocity of the two masses with respect to the direction of the x axis is -15 degrees. what is v?

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42i + 5v j is total before (and therefore after)
so tan -15 = 5v/42

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