Use the problem below to answer the following questions. A 300 kg cart, originally at rest, is launched off of the top of a small 5 m hill by a spring that is
compressed 3 m. If the spring stiffness (constant) is 4000 N/m, then how fast was the cart moving at
the bottom of the hill?

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.