Final answer:
A sprinter explodes out of the starting block by utilizing stored elastic energy in muscles and generating a reaction force from pushing back on the track to gain acceleration.
Step-by-step explanation:
When a sprinter explodes out of the starting block, one of the key factors at play is the utilization of stored elastic energy in muscles. A sprinter exploses out of the starting block by utilizing stored elastic energy in muscles and generating a reaction force from pushing back on the track to gain acceleration.
This stored energy is released like a spring, allowing the sprinter to generate a powerful initial thrust forward. Additionally, by pushing back hard on the track, the sprinter generates a reaction force that propels them forward to gain acceleration.