The decline bench press gives you have a limited range of motion. You can use more weight because of both mechanical advantage and less total work being performed. By only bringing the bar down to your lower chest, you severely limit the distance you move the bar.
The time difference that you sense is due to the way sound and light travel. Light travels extremely fast (300,000,000 m/s). In fact, it is faster than anything else. Sound travels at a measly 343 m/s through air. Therefore we can see light in an instant, but it takes a while to hear thunder. Sound has another disadvantage because it tends to bounce off molecules in the air. This makes the sound travel in all different directions.
Contrary to what some think, thunder is not caused by the lightning bolt âbreaking the sound barrierâ. If this were true, then every time we turned on a light in the house we would hear a sonic boom! The speed of light is about 186,282 miles per second. The speed of sound is about 0.211 miles per second at sea level.