What are the 4 groups of carbon compounds found in living things

Apositive point charge q is fixed on a very large horizontal frictionless tabletop. a second positive point charge q is released from rest near the stationary charge and is free to move. which statement best describes the motion of q after it is released? assume q stays on the table

Protons and neutrons are found within the nucleus of an atom

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