What is the only difference between the reactant and product side of a chemical reaction?

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Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.