In the diagram of a transverse wave shown, what does L represent?

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.

Newtons view of arrangement of the universe

Of is j/kg·k. if a 2.6 kg of isk to k,is ?