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Same concept as before - the potential energy you apply in raising the object 2m is converted to KE as the object falls. The amount of work you put into the system is force x distance: here the force is the object's weight = mg. So you have: PE = mgh (where h = 2 m) Which gets converted to KE = 1/2 m v^2. So: PE = KE mgh = 1/2mv^2 Note that the mass terms cancel out - in other woirds, you get the same answer regardless of the actual mass of the pendulum. Now you can solve for v. |
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