# A ball is thrown straight up into the air Its position may be measured as the vertical distance from the ground and is given by the equation S (+) =- 16t2+ 128+ +5 where t, measured in seconds, and S (D) is measured in feet. Use this to answer the following questions. a. what is the velocity after 2 seconds? b. What is the acceleration after 2 seconds? C. At what time is the velocity -32 feet per Second ? d. When is the ball at a height of 117 feet