1. Suppose an 80 kg hockey player is skating north at 4 m/s (that's meters per second) and just grabs a 60 kg hockey player, who's initially stationary, and carries him. Just after grabbing this guy, what is the velocity of the hockey player? Is kinetic energy conserved?

2. Suppose you jump straight up, and you jump to a height of 0.3 meters. Before you jumped, your momentum was zero, and afterwards it was not. Does this mean that momentum is not conserved? Of course not! Calculate the recoil motion of the earth, given that the mass of the earth is 6x10^24 kg. (That's a 6 with 24 zeroes after it.)