Answer:
Matter
Pure substances Mixture
Element compound Homogenous Heterogenous
The energy bar eaten by Sheila has chemical energy locked up inside it. This chemical energy is converted to mechanical energy in form of potential and kinetic energy and this in turn is converted to heat energy as the run progresses. Thus, the energy changes are: chemical energy to mechanical energy [kinetic and potential] and finally to heat energy.
Answer:
I don't know sorry hopefully I can help with something else tho
