Aroller coaster track is 3,000 meters long. it takes 100 seconds to travel once around the roller coaster. what is the average speedof the roller coaster? is the velocity constant throughout the trip explain.

Why is any chemical reaction always balanced? give reasons and explain the easiest way to solve the balancing problems in chemical equations with stoichiometric coefficients upto 20 as hit and trial doesn't always work. give full reasoning