Two cannons are pointed directly towards each other, (one on the ground pointing upwards, A, second on a hill pointing downwards, B. both pointing at each other). When fired, the cannonballs will follow the trajectories, crossing each other’s path, in an arched manner. If we want cannonballs to hit each other, must the gun crews fire cannon A first, cannon B first, or must they fire simultaneously? Ignore any effects due to air resistance.