In your own words, define momentum. What equation for momentum? What is the unit for momentum?

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

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

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?