Skier 1 is going by a slippery snowy hill. He has a mass of 20kg, and he is sliding the hill at a velocity of 5m/s. His elder brother has a mass of 30kg. His brother is moving slower with a velocity of 2m/s. Skier collides to his brother. Then both of them keep going down the hill as one unit. Calculate the resulting velocity of skier 1

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