12. A 0.25-kg snowball moving at 15 m/s [E] collides and sticks with a 1.9-kg toy struck travelling at 2.8 m/s [W]. Neglecting friction, calculate the velocity of the snowball-truck system after the collision. (3 marks) 13. A satellite orbits Earth at an altitude of 325 km above the planet's surface. What is its orbital period? Express your answer in minutes. (4 marks) 14. A two-point source interference pattern is generated in a swimming pool. A piece of styrofoam, located on the second nodal line, is 12.0 m from one source and 20.0 m from the other source. One wave crest takes 2.0 s to travel the 35.0 m width of the pool. Find the speed, wavelength, and frequency of the waves