Pleas help me with this

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.