A particle with a mass of 400 g moving at 2.0 m/s collides elastically with a stationary particle whose mass is 240 g. After the collision, the 400 g mass is moving at 1.5 m/s. Through what angle is its path deflected? There is no image or mention of what angle from the x-axis the particle approaches the stationary one with. If someone could explain to me how to solve this I would appreciate it alot.