When is mechanical energy NOT conserved? ANSWER ASAP WILL GIVE BRAINLIEST IF CORRECT A-When you are in outer space

B-When it is cold outside

C-When the electricity is turned off

D-When there is significant friction or air resistance or other force affecting on the object.

hope this helps D.

Explanation:

Mechanical energy may not be conserved when nonconservative forces act. For example, when a car is brought to a stop by friction on level ground, it loses kinetic energy, which is dissipated as thermal energy, reducing its mechanical energy.

A when you are in outer space since there is no gravity the mechanical energy just continues to push the direction it was pointed to  

see earlier