\displaystyle v^2=v_0^2+2as \Rightarrow (6m/s)^2=0^2+2a(3,6m) \Rightarrow a=5m/s^2 \displaystyle v=v_0+at \Rightarrow 6m/s+(5m/s^2)t \Rightarrow t=\frac{6}{5}s
