A group of particles of total mass 41 kg has total kinetic energy of 329 J. The kinetic energy relative to the center of mass is 85 J. What is speed of the center of mass?

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

Give an example in which the electrical energy changes to light energy

Which of hubble’s discovery support the big bang theory