Given a graph of velocity v. time, what does a horizontal line represent? The object’s acceleration is positive. The object is moving at constant velocity. The object’s acceleration is negative. The object is standing still.

Sorry i think the answer is b

The answer to your q the total mass is 73

Yes it i’m going home to now my and i️

13 protons and 14 neutrons.  this also means that the amount of electrons also is 13 because electrons have the same amount as protons..the atomic number means the amount of protons (which effectively tells you the electrons) the atomic mass, tells you the amount of protons and neutrons in the nucleus.hope this .