The main purpose of the turbine in the turbojet engine is to? a. reduce the temperature of the exaust gas. b. increase the velocity of the exaust gasses. c. compress the air. d. drive the compressor.

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.