Kieran pushes a box with a force of 35 N. It accelerates at 5 m/s2. What is the first step that
the mass of the box?
Identify the formula to calculate velocity.
Identify the formula to calculate acceleration.
Identify the formula to calculate force.
Identify the formula to calculate weight.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.