A 30kg cart moving at 20 m/s collides elastically with a 20kg cart moving at 10m/s. If after the collision the 30 kg cart is 12m/s, then what is the velocity of the 20 kg cart after the collision?

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Most of the volume of an atom is occupied by the

Which of the following is the best name for mgcl2