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A 3.4 kg grenade initially at rest explodes into three pieces. A 1.2 kg piece is heading
at a speed of 5.3 m/s (S 45 W). A second piece of 0.9 kg is heading [N 30° E]
at a speed of 4.1 m/s. Determines the vector velocity of the third piece. and the angle it explodes in

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