Two people are standing 1.58 m apart. A spy satellite is 1.29x106 m above them. What must the diameter of the satellite's camera lens be to resolve the image of the people, using 480 nm light

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.