A store determines that the daily profit on pens obtained by charging 5 dollars per pen is _ 2 MS) ' - 105 + 755 - 5. If the store currently charges 50 cents for a pen, find the rate of change of profit. Question 17 10 Points A ball is dropped from the top of a building that is 15 m high. The position of the ball after t seconds is given by the equation S(t) = - 4.9t + 15. Find the instantaneous acceleration of the ball after t seconds. A -4.9; m/ s2 B -9.8; m/ s2 C -9.8t; m/ s2 D -4.9t; m/ $2