1.8461 km/hr Well i need more characters so i might as well type a beautiful sentence for you to read and waste your time on.
the answer i think is asphalt and plastic
Kinetic energy is proportional to the square of the speed. So when anything or anybody speeds up, its kinetic energy increases.
Thinking the small glass bead as a single point charge, the electric field generated by it is given by

where

is the Coulomb's constant

is the charge of the bead

is the distance at which we calculate the field.
Using these data, we find: