A spring is hung from the ceiling. A 0.504-kg block is then attached to the free end of the spring. When released from rest, the block drops 0.125 m before momentarily coming to rest, after which it moves back upward. (a) What is the spring constant of the spring? (b) Find the angular frequency of the block's vibrations.

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

a is the best answer your welcome