What happens to the speeds of the particles when thermal conduction is occuring within a solid? a. fast particles speed up, and slower ones slow down b. fast particles slow down, and slower ones speed up c. both fast particles and slow particles speed up d. both fast particles and slow particles slow down !

C. Both fast particles and slow particles speed up

if the forces acting on an object are unbalanced, the object will accelerate in the direction of the net force on the object.

explanation:

this is best explained by having an understanding of newton's second law, which states that f=ma. you see, when the forces are unbalanced, net force (sum of all forces) is not zero. therefore making it necessary for the object to have an acceleration in the direction of the net force.