Answer:
Rock
Explanation:
Let's calculate the density of each object:
Rock:
Pencil:
Therefore the rock is denser.
The particles cannot move around at all. The particles are, however, still in motion.
There is a very simple relationship between the three. First off, power is the amount of energy used over a certain amount of time. Energy is the capacity of carrying out that power. Lastly, time depends on how much energy you have to exert the work.
Hope this helps :)