Problems 1 Say that the height s of a ball thrown into the air is given by s t 16t 20t 10 a Sketch a graph of s t on the time interval 0 t 2 b Find the average velocity of the ball on the interval 0 t 1 c Find the instantaneous velocity of the ball at t 1 Is the ball going up or going down at that time d Find the equation of the tangent line to the graph of s t at t 1 e On your graph in part a sketch the secant line on the interval 0 t 1 and the tangent line at t 1