Apassenger in a helicopter traveling upwards at 15 m/s accidentally drops a package out the window. if it takes 15 seconds to reach the ground, how high to the nearest meter was the helicopter when the package was dropped?

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.