EXAMPLE 2 Velocity and acceleration Suppose the position (in feet) of an object moving horizontally at time t (in seconds) is s = f2 S t for 0 g t g 5 (Figure 3.42) Assume that positive values of 5 correspond to positions to the right of: = 0' av Graph the velocity function on the interval 0 s t s 5, and deteimine when the object is stationary, moving to the left, and moving to the right. b. Graph the acceleration function on the interval 0 s t s 5, and deteimine the acceleration of the object when its velocity is ZEI'O' c. Describe the motion of the object time Position: 5 = t2 5 t 80%