12). If a spring was scratched to 0.6m and has the elastic potential energy 40J stored. What is the spring constant of the spring? *

Have you ever wondered why rubbing a balloon or a blanket—or even a winter hat—on your head makes your hair stand up? The effect is due to static electricity, but how is the static electricity made, and why does it make your hair stand on end?

Explanation:thank you for asking

f=ma newton's second law 7x8=56n