A marksman standing on a motionless railroad car fires a into the air at an angle of 30.0° from the horizontal. The bullet has a speed of 173 m/s (relative to the ground) and a mass of 0.010 kg. The man and car move to the left gun at a speed of 1.0 × 10-³ m/s after he shoots. What is the mass of the man and car? 30.0°

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