1.)A sailboat heads west at 10 km/h in a calm sea. If a breeze of 8.0 km/h [S40oW] begins to blow. What is the sailboat’s resultant velocity?

2.) A student is determined to test the law of gravity for himself. He walks off a skyscraper 320 m high with stopwatch in hand, and starts his free fall. Five seconds later, Superman arrives at the scene and dives off the roof to save the student. What must Superman’s initial velocity be in order to catch the student just before the student reaches the ground? (Assume that Superman’s acceleration is that of any freely falling body ( g = 9.81 m/s2)