The 2-mg Car Increases its speed uniformly from rest to
28 m/s in 30s up the incline road
determine the maximum power
that must supplied by the engine
which operates with an efficiency
of e=0.8 Also find the
average power supplied by the
engine .

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.