9. (8 points) Each year, the Physics Club does a Pumpkin Drop. If the pumpkin is dropped from 46 feet high, its height in feet $t$ seconds later is given by $s(t) = -16t^2 + 46$. Find the average velocity of the pumpkin during the time interval $[1.5, 1.6]$. You may give a decimal answer. Be sure to show your work (steps, formulas, etc.).