A marksman standing on a motionless railroad car fires a gun into the air at an angle of 30.0° from the horizontal (the figure below). The bullet has a speed of 175 m/s (relative to the ground) and a mass of 0.0110 kg. The man and car move to the left at a speed of 1.20 10−3 m/s after he shoots. What is the mass of the man and car? [Hint: A component of a system's momentum along an axis is conserved if the net external force acting on the system has no component along that axis.] I know that Pi = Pf where there is conservation of momentum. so M1V1i + M2V2i = M1V1f + M2V2f 0 = M1V1f + M2V2f but I'm not sure what numbers to plug in because there is also an angle involved.