This is a tectonic plate boundary in the pacific ocean where volcanoes are very common.

What is the momentum of a 2 kg object moving at 15 meters per second

Can anybody me with this? ? (picture included.)

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.