It might be a bit blur. Please help

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

What is the mass of 4 molecules of co2

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum