two balls with masses m1=8kg and m2=4kg collide in the horizontal head-on collision speeds v1 before=12 m/s and v2 before=5 m/s(see the picture below). what will be the speeds of each ball after an elastic collision?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)