Automobiles rust faster in wet climate because the chemical reaction between the metal and the iron, oxygen or water
breaks down, or oxidizes, the metal causing the appearance of rust.
15 = a+(3-1)d
23 = a+(7-1)d
simultaneous eqs. solve for a and d
The acceleration depends on the mass of an object
Answer: The half-life is the amount of time it takes for a given isotope to lose half of its radioactivity. If a radioisotope has a half-life of 14 days, half of its atoms will have decayed within 14 days. In 14 more days, half of that remaining half will decay, and so on.