A ball of mass m is raised to height h and then dropped to the ground. When the ball reaches the ground, the velocity of the ball is (neglecting air resistance), where g is the acceleration due to gravity.
1
\(\sqrt {g\;h}\)
2
\(\sqrt {2g\;h}\)
3
\(\sqrt {g\;h/2}\)
4
\(2\sqrt {g\;h}\)