a ball is launched horizontally from a height of 3.2 m and strikes the ground 4.1 meters away
(measured horizontally). what was the initial velocity of the ball? would a stopwatch be a
reasonable device for measuring the time this takes? why or why not?

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