Answer:
A. Repeat the experiment to be sure the results are valid.
The amount of air resistance<span> an </span>object<span> experiences depends on its speed, its cross-sectional area, its shape and the density of the </span>air<span>. </span>Air<span> densities vary with altitude, temperature and humidity. Nonetheless, 1.29 kg/m</span>3<span> is a very reasonable value. The shape of an </span>object affects<span> the drag coefficient (C</span>d<span>)</span>
The answer is the third one down. New evidence may contradict the old evidence of a certain theory.
C. unbalanced is the correct answer for newton's first law.
