Gravity is a force of attraction based upon the mass of two objects and the distance between them. Why aren’t other objects, like the pencil on your desk, being pulled toward you right now? Explain your reasoning, using words and formulaic calculations.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.