posted by Dan .
Find the speed, v, of a pendulum at the bottom of its swing (B), given that it has mass m and initial height at A is h (the difference in height from B to A). Your answer will be in terms of g as well.
Included is a drawing of a pendulum at its maximum height (A), and at its minimum height (the middle) (B), and once again at its maximum height, on the other side (C).
potential energy at top (stopped) = kinetic energy at bottom
m g h = (1/2) m v^2
v = sqrt (2 g h)