Acceleration can be best described as:
The ability of an object to stay still.
The ability of an object to speed up.
The ability of an object to stop.
The ability of an object to slow down.

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

What component of earth’s atmosphere exists entirely as a result of photosynthesis?