An object on a rough surface has a maximum static friction of 2 N and kinetic friction of 1 N. If a 5-N push causes the object to slide across the surface, what is the magnitude of the static frictional force while the object is moving

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.