Why on the smooth surface the net force is zero?​

When you go to ask a qustion there will be a picture of a paper clip looking thing and then it will pop up your files and you click on the imajes and then you up load it

F  you double the  force, you double the acceleration, but  if  you double the  mass, you velocity. all bodies accelerate at the  same  rate regardless of size or  mass.

Ithink c because you have to work to become goid

Carbon dioxide because it consists of one type of molecule.