Two friends push with great force against a rock. The forces are equally strong but in opposite directions. A heavy box rests on top of the rock. Answer these questions about the motion of the rock. Assume that the rock is light enough for either friend to carry. One friend steps away from the rock. Does the rock move? If so, in which direction does it move?

An object at rest is not moving unless and unbalanced force moves it. ... motion will continue to move at a constant speed in the same direction forever ... But, it will take the harsh unbalanced force of your foot for the rock to move. ... That same amount of small force was NOT big enough for the carriage to pull

Explanation:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

elements make up everything, and they combine to make compounds.

the answer is c