The figure above shows a boy swinging on a rope, starting at apoint higher than "a". consider the following distinct forces: 1. a downward force of gravity.2. a force exerted by the rope pointing from "a" to "o".3. a force in the direction of the boys motion.4. a force pointing from "o" to "a".which of the above forces are acting on the boy when he is inposition "a"? a)1 onlyb)1 and 2c)1 and 3

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

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