Janet wants to find the spring constant of a given spring, so she hangs the spring vertically and attaches a 0.61 kg mass to the spring's other end. if the spring stretches 4.0 cm from its equilibrium position, what is the spring constant?

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?