A circus cannon, which has a mass M = 2500 kg, is tilted at q = 35°. When it shoots a projectile at v0 = 30 m/s with respect to the cannon, the cannon recoils along a horizontal track at vcannon = 2 m/s with respect to the ground. a) At what angle to the horizontal does the projectile move with respect to the ground? b) What is the mass of the projectile? HELP: Use conservation of momentum. HELP: Since the system is initially at rest and since there are no external forces in the horizontal direction, the horizontal component of the momentum of the cannon must be equal and opposite to the horizontal component of the momentum of the projectile (in the ground reference frame!). So you need to find the momentum of the projectile in the ground reference frame. I already solved a, and it is 37 degrees. but i just cant solve a. any suggestions would be of great help.