At a school dance on Mars, aliens Jack and Jill are at the opposite sides of the gym which is 50m long. Jack has a mass of 70kg and Jill has a mass of 60kg. What is the magnitude of force between Jack and Jill?

4. who was the first one to measure the speed of light and conclude that it is finite? 5. who was the first philosopher who thought the speed of light is finite? 13. what is the speed of light numerically? 14. give an example of something moving faster than light 15. give an example for some particles or waves that

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?