A car went 50 km to the south during 45 min and then 60 km to the east during 80 min. (30 pts.) a) What is the total displacement vector (start to end) describing its motion? b) What is the average velocity vector (magnitude and direction)? c) What is the average speed of the car? A steel ball is dropped from yo 70 m. At what height y is it expected to be after I s and after 3 s? Acceleration of gravity is a -9.8 m/s