Achild is sliding down a slide at the playground. is the mechanical energy conserved? why or why not? the mechanical energy is conserved. there is as much ke at the end as there was pe at the beginning. the mechanical energy isn't conserved. some energy is lost to friction. mechanical energy is always conserved. the mechanical energy isn't conserved. some energy is lost to gravity.

The mechanical energy isn't conserved. Some energy is lost to friction.

Explanation:

The energy of the system isn´t conserved because the whole system has other forces involved on it, in the ideal case with no friction or resistance the mechanical energy should be conerved and should always add up to the initial potential energy of the system, since this is not the case of a closed sytem and there is friction we could say that mechanical energy is lost to frictio and it isnñt conserved.