1. A cheetah can run briefly with a speed of 31 m/s. Suppose a cheetah with a mass of 47 kg
runs at this speed. What is the cheetah's
kinetic energy

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.