The common energy that allows you to send a rubber band across the room is elastic potential energy.

Here's how it works:

1. Stretching the rubber band: When you stretch the rubber band, you are storing energy within its elastic structure. This stored energy is called elastic potential energy.

2. Releasing the rubber band: When you let go of the rubber band, the stored elastic potential energy is converted into kinetic energy (energy of motion). This kinetic energy propels the rubber band across the room.

So, it's not your strength that sends the rubber band flying, but the stored elastic potential energy within the rubber band itself.