An object is thrown upward from ground level at a velocity of 123 feet per second. t = 3, t2 = 5 (a) Use the position equation s = -16t + vat + s to write a function that represents the situation. Use a graphing utility to graph the function. (b) Find the average rate of change (in ft/sec) of the function from t, to t2. ft/sec (c) Describe the slope of the secant line through t, and t,. The slope of the secant line is positive. The slope of the secant line is negative. (d) Find the equation of the secant line through t, and t, . Graph the secant line in the same viewing window as your position function. y (t) =