Which of these is an example of pseudoscience? chemistry astrology astronomy mathematics

The radius of an atom is closest in size to a

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.

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