Physics

This is a classic energy conservation problem where gravitational potential energy converts entirely into kinetic energy. Rather than tracking the motion step-by-step, recognize that the ball's initial $mgh$ is completely transformed into $\frac{1}{2}mv^2$ by the time it hits the ground—no energy is lost. Set these equal and solve for $v$; notice the mass cancels out, so the answer depends only on height and gravity.

This is a classic energy conservation problem where gravitational potential energy converts entirely into kinetic energy. Rather than tracking the motion step-by-step, recognize that the ball's initial $mgh$ is completely transformed into $\frac{1}{2}mv^2$ by the time it hits the ground—no energy is lost. Set these equal and solve for $v$; notice the mass cancels out, so the answer depends only on height and gravity.