% error =

x 100%
Experimental: 2.85
Actual (theoretical): 2.70
% error =

x 100% = .055555 x 100% = 5.56%
The amount of physical material in an object
A skateboard coasting on a flat surface slows down and then comes to a stop because the skateboard runs out of energy, and slows down, also, sense it is on a flat surface and not going downhill, it goes slower.
Answer:
Iron has 30 neutrons.
A neutral iron atom contains 26 protons, 30 neutrons, plus 26 different shells around the nucleus.
Explanation:
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