100 pointss!!
(see attached)

C

Explanation:

Newton's Second Law of Motion states that acceleration is dependent on 2 things: the net force acting upon the object and the object's mass.

This law is shown is these equations:

acceleration=net force/mass

net force=acceleration*mass

Hope this helps! :)

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

layer 3 is younger than layer 6.