A2.40 kg stone is sliding in the +x-direction on a horizontal, frictionless surface. it collides with a 4.00 kg stone at rest. after the collision the 2.40 kg stone is moving at 3.60 m/s at an angle of 30.0∘ measured from the +x-direction toward the +y-direction and the 4.00 kg stone is moving at an angle of 45.0∘ measured from the +x-direction toward the −y-direction. what is the y-component of momentum of the 2.40 kg stone after the collision?