1. The problem statement, all variables and given/known data A stone is thrown downward with a speed of 18 m/s from a height of 11 m. (acceleration due to gravity: 9.81 m/s2) Your answers must be accurate to at least 1%. Give your answers to at least three significant figures. a) What is the speed (in m/s) of the stone just before it hits the ground? b) How long does it take (in seconds) for the stone to hit the ground? 3. The attempt at a solution When I attempted the first part, I used the equation V^2=Vo^2+2a(X-Xo), and plugged in the numbers, V^2=(18^2)+2(9.81)(-11) and the answer came out to be 10.401 m/s and it was wrong. When I tried the second part, I used the equation V=Vo+at and plugged in the numbers 0=18+(9.81)t and the answer was 8.19 s.