The image shows the combustion of methane. which equation represents this chemical reaction? ch4 + o2 → co2 + h2o
2ch4 + 2o2 → co2 + 2h2o
ch4 + 2o2 → 2co2 + h2o
ch4 + o2 → 2co2 + 2 h2o
ch4 + 2o2 → co2 + 2h2o

CH4 + 2O2>CO2+ 2H2O, the last choice is the correct answer

Mary concludes that the foam rubber balls’ acceleration during the collision was THE SAME AS the steel balls’ acceleration. She concludes that the collision between the foam rubber balls is an ELASTIC collision.

The masses of the two objects are the same therefore its acceleration would also become the same. It is an elastic collision because little or less friction occurred in the situation creating kinetic energy.