Balls a, with a mass of 20 kg, is moving to the right at 20 m/s. at what velocity should ball b, with a mass of 40 kg, move so that they both come to standstill upon collision?

True or false graphs must include scales that increase by the same amount

The heliocentric and the geocentric models of the solar system included these central principles

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: