1. A 2 kg ball is sitting still. A second ball with a mass of 2.5 kg is moving at 1.3 m/s to the
east. The second ball hits the first ball and stops immediately. What will be the velocity
of the first ball? Assume the collision is entirely elastic.

Abag of potato chips contains 2.00 l of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0 deg c. what will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00 deg c and atmospheric pressure is 70.0 kpa? assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.