erobz
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Good.printereater said:In x-coordinate direction,
$$T\sin(\beta )=\dot{m}v_{0}\sin\left ( \theta \right )$$
In y-coordinate direction,
$$W-T\cos(\beta )=\dot{m}v_{0}\cos\left ( \theta \right)- \dot{m}v_{i}$$
Just to practice this whole convention issue you were(hopfully) having rewrite your equations for "up is positive" and "right is positive".