Question: Please help idk what I'm doing wrong. As shown in the figure below, a cannon on a railroad car is facing in a direction parallel

Please help idk what I'm doing wrong.

As shown in the figure below, a cannon on a railroad car is facing in a direction parallel to the tracks. It fires a 92.3-kg shell at a speed of v = 124 m/s (relative to the ground) at an angle of 0 = 58.70 above the horizontal. If the cannon plus car have a mass of 4.96 x 10# kg, what is the recoil speed of the car if it was at rest before the cannon was fired

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