The graphs show the position s = (t) of an object moving up and down on a coordinate line. (a) When is the object moving

The graphs show the position s = ƒ(t) of an object moving up and down on a coordinate line. 

(a) When is the object moving away from the origin? Toward the origin? At approximately what times is the 

(b) Velocity equal to zero? 

(c) Acceleration equal to zero? 

(d) When is the acceleration positive? Negative?

Displacement S 5 s = f(t) 10 Time (sec) 15