Всяко действие има равно по големина и противоположно по посока противодействие.
Answer:
it is ---D because you can't measure gas and it's mass
HOPE THIS HELPS
It is a chemical change. I always think of a chemical/physical change as if you could reverse it back as it started off, for example if you stepped on a can you can reverse the can back probably not exactly like it was before but you can still reverse it so this would be a physical change, and if you baked a pizza you could not reverse the dough and everything else back.
Answer:

Explanation:
By energy conservation we know that spring energy is converted into kinetic energy of the block
so we will have

so we will have

now we will have same thing for another mass 4m which moves out with speed 5v
so we have

now from above two equations we have

so we have

Answer:yes because of increase of intermolecular space
Due to increase in heat