For something to be considered mechanical energy what has to happen? This may be the most important idea to understand about mechanical energy

Mechanical Energy - The Physics Classroom

Objects have mechanical energy if they are in motion and/or if they are at some position relative to a zero potential energy position (for example, a brick held at a vertical position above the ground or zero height position). A moving car possesses mechanical energy due to its motion (kinetic energy).

your answer would be a. 12.5 kg

clouds form

solid ice forms on leaves.

water droplets form on grass.