What was the initial speed of a car if its speed is 40 m/s after 5 seconds of accelerating at 4 m/s2? A. 10 m/s B. 60 m/s C. 25 m/s D. 20 m/s

Madison lives near the ocean. she’s formed a hypothesis that increased concentrations of salt in the air speeds the corrosion of certain metals. if madison plans to test this hypothesis, she will have to deal with the following variables in her experiment: dependent variable: independent variable: one possible confounding variable: