hi im taking grade 12 physics and i have 2 quesions which im not sure about. 1) a 45 kg student stand on a staitionary 33 kg raft. the student walks with a velocity of 1.9m/s [E] relative to the water. what is the resulting velocity of the raft, relative to the water, if fluid friction is negligible? for this i thought it would be that the raft would be moving 1.9 m/s [w] because it will stay staitionary while the student walks [E]. am i right? 2) There is an elastic collision of two balls on a frictionless table. ball A has a mass of .5 kg and ball B has a mass of .3 kg. Ball A has an initial velocity of 4 m/s in the positive x-direction and a final velocity of 2 m/s in an unknown direction. ball B is initially at rest. Determine the final speed of Vb2 ball B and the angles Alpha and Bata. the ball goes straight hits on and they both go forth but in different directions. -- O ball a ball b -- ball a -----O>------o ---------- -- ball b -- o i actually dont have enoguh physics background to do this one. so if neone knows how please help me on this.