Which statement correctly describes magnetic field lines? A. They are parallel with one another.
B. They show the direction a south pole will point.
C. They form loops.
D. They join north pole to north pole.

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.