A 2 kg red ball traveling east at 3 m/s collides head on with a 6kg blue ball traveling west at 1 m/s. - What is the momentum of the red ball before the collision?
- What is the momentum of the blue ball before the collision?
- What is the total momentum before the collision?

you have to draw the persons position over there

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

snell's law

refractve index = sin incidence / sin refraction

3. dark matter

empty space could also be a simple vacuum