1. A group of students are performing an experiment in class using collision carts on a track. An 8 kg cart with a velocity of 4 m/s hit a stationary cart
weighing 4kg. The 8 kg cart stops and the 4 kg cart keeps going. What is
the velocity of the 4 kg cart after the collision?

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is

Answer is: value of q is 5·10⁻⁶m.chemical reaction: mg²⁺(aq) + co₃²⁻(aq) → mgco₃(s).c(mg²⁺) = 2.5·10⁻³ m; concentration of magnesium cations.c(co₃²⁻) = 2.00·10⁻³ m; concentration of carbonate anions.q = c(mg²⁺)  · c(co₃²⁻).q = 2.5·10⁻³ m  · 2.00·10⁻³ m.q = 5·10⁻⁶m.q = 0.000005 m.

Its not chemical its not radiation and its not convection because there is not movement of fluids so it is thermal conduction