Astudent conducts an experiment to determine how the additional of salt to water affects the density of the water. the student fills 3 beakers with equal amounts of water. he then adds 1 cup of salt to the first beaker, 2 cups of salt to the second beaker and no salt to the third beaker. what is the dependent variable in the student's investigation?

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.