An object is dropped from a height of 25 meters. at what velocity will it hit the ground?

a. 7.0 meters/second
b. 11 meters/second
c. 22 meters/second
d. 49 meters/second
e. 70 meters/second

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.