Answer
The required speed is:
$$v=7.9\text{ m/s}.$$
Work Step by Step
The horizontal component of the velocity constant, i.e.
$$v_h=1.85\text{ m/s},$$
The vertical component is due to the gravitational acceleration, and since there is no initial speed in this direction we have for the final vertical component:
$$v_v=\sqrt{2gh}.$$
The final speed is thus:
$$v=\sqrt{v_h^2+v_v^2}=\sqrt{v_h^2+2gh}=\sqrt{1.85^2+2\cdot9.81\cdot 3.00}\text{ m/s}=7.9\text{ m/s}.$$
