It is because the weight is equal to each other and balances out. example war ships have tons of metal, but it spreads the weight on the water
Using q=1.60217662 E-19 C we get:

Then using 9.10938356E-31 kg as the mass, we get
Answer:
Since v = (x(2) - x(1)) / t
point 2 obviously has the greatest displacement in a given time
Also, point 2 is the steepest line on this graph.
Iron is the answer. Becaues its solid and it's particles are closest to each other. And well.metals are good at transferring heat.