3(a)(7pts) Two balls collide. Ball 1 is traveling to the right at 35m/s, and ball 2 is moving to the left with a speed of 12m/s. If ball 2 has two times the mass of ball 1 , and ball 1 bounces back with a speed of 8m/s, find the direction and magnitude of the velocity of the second ball? (b) (8pts) An 10kg mass moving north at 15m/s on a frictionless horizontal surface collides with a 8kg mass that is moving east at 4.5m/s. After collision, the two objects stick together, what is the speed of the two object system