The distance between a charge and the source of an electric field changes from 3 mm to 6 mm. As a result of the change, the electric potential energy of the charge is

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

d. platinum would have the greatest temperature increase because it has the lowest specific heat.

80cm/s.

24cm/s.

53.3cm/s.