An airplane flies 100 km north in 20 min, then 150 km west in 40 min and finally 500 km
south in 52 min.
a. what is the total distance and total displacement of the plane?
b. what are the average velocity and average speed for the trip?

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory