Now measure the length of each line with your metric ruler. Enter these measurements in the data table below. Remember that you will have 2 digits to the right of the decimal

Sorry i dont understand the question can you rephase it?

The velocity would be 2 

Van der waals forces are temporary electromagnetic forces established between uncharged atoms. some neutral molecules, when close together, can become temporarily “charged,” as electrons move around the atom. water is a polar molecule, the side of the molecule that the hydrogens bond to being more positive, and the opposite side bound to the lone pairs of electrons being more negative. this means that it participates in dipole-dipole interaction (non-polar exhibits dispersion forces), and it has the capacity for hydrogen bonding.