When two tectonic plates collide, new mountain ranges can be formed as rock in the Earth’s crust is thrust upward. Usually this action involves one plate being pushed underneath another plate as shown in the diagram below. Which of Newton’s Laws best describes why the edge of the right-hand plate forms mountains while the left-hand plate is submerged beneath the right in the picture?

Law of Inertia (1st Law)
Law of Acceleration (2nd Law)
Action-Reaction Law (3rd Law)
Law of Universal Gravitation (4th Law)

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?