Please someone write a book with me pls??

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm

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.

Why does gravity have a lesser than grater effect on higher altitudes?