A toy car's movement is measured using photogates. The car's position-time graph is shown below.

Which of the following statements describes the velocity of this car?

How can you improve the percent yield of copper in this lab? check all possible strategies that will you do so. measure reactants precisely. stir to the reaction take place. chill the reactants before combining them. wait patiently until the reaction completes. make sure to recover as much copper as possible.