Which travels at the greatest speed?
a. sound through air
b. light through glass
c. sound through water
d. light through a vaccum.
i think it's between a. and d. but i'm not sure. me

Select all the correct answers. which three statements about electromagnetic radiation are true?

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.