Below is a simple simulation using Three.js of a rigid rod with a mass at the end, suspended from the roof of a boxing ring. The user can grab the mass with the mouse and release it at any position, constrained by the rigid rod. ```html Boxing Ring Pendulum

Mass: 30 kg

Rod Length: 1 m

Gravity: 9.81 m/s²

Click and drag to move the mass

Release to see pendulum motion

``` This code creates a simple pendulum simulation with a mass at the end of a rod. The user can grab the mass with the mouse and release it at any position, constrained by the rod. The pendulum's energy and power are displayed on the screen in real-time. The simulation uses the Three.js