A ball of mass $3\mathrm{.}0kg$ is tied to the end of a $50-cm$ length of string. The ball and string are swung in a circle in a vertical plane at constant speed $v,$ which is the minimum speed neressary to keep the string taut at all times. The center of the circle is a distance $h=190cm$

What is the speed of the ball?

$2\mathrm{.}2$ mis

$1\mathrm{.}7\frac{m}{s}$

$3\mathrm{.}7$ m$/$s

$3\mathrm{.}0$ m$/$s