Ben makes five paper helicopters with different when leaves he drops them at the same from a height of 2 measures 4/5 Chelsea Pier acquired the amount of the time it takes for each helicopter to Fox and crafts what is the independent variable

The question is unclear, however, it can still be answered based on understanding of the topic, with correct explanation.

The independent variable is the HELICOPTERS MADE FROM DIFFERENT MATERIALS

Explanation:

The independent variable in an experiment is the variable that the experimenter manipulates or changes in order to effect a response in the dependent variable. The independent variable is also called the experimental variable.

In this case, Ben makes five paper helicopters using different materials and tests the amount of time each paper helicopter will take to fall. Hence, the PAPER HELICOPTERS MADE FROM DIFFERENT MATERIALS is the independent variable, which determines how long they will fly (dependent variable)

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.