Imagine a 4kg ball traveling at 10 m/s to the right strikes a 2kg ball traveling at 4
m/s to the left. If the collision is elastic
and the 4kg ball is traveling at 2m/s to
the left after the collision, what is the
velocity of the 2kg ball? What is the
kinetic energy of the 2kg ball?

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point

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:

Farmer a has a deep well and needs a lot of water for her animals and crops. her neighbor, farmer b, has a shallower well. he needs less water than farmer a because his farm is smaller. in years of drought, sometimes farmer b can't get any water from his wells. what can farmer b do to decrease the likelihood of his well running dry?