Calculus help now

3. The displacement of an object is given by the function s(t) shown below where t is measured in seconds and s is measured in meters. (a) (2 points) At what t values is the object stationary (approximate if necessary)? How do you know? (b) (2 points) Is the instantaneous velocity at t = 1 positive or negative? How do you know? (c) (2 points) Is the speed of the object increasing or decreasing at t = 1? How do you know? (d) (3 points) Consider the object's motion between t = 1 and t = 5. What is the displacement of the object over this time? Explain why this value is different than the distance traveled over this time. Approximate the distance traveled by using the graph