A 25.0 [cm] long spring stands vertically on the ground, with its lower end secured in a base. A brick with mass, 1.5 [kg] is held 40 [cm] directly above the spring and dropped onto the spring. The spring compresses to a length of 17.0 [cm] before starting to launch the brick back upward. What is the spring’s spring constant?

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.