A motionless mass, hung on the end of a spring and pulled 5 cm downward, is a height of 1 meter above the classroom floor. Is that potential, kinetic, or elastic energy ?

See the explanation below

Explanation:

After the mass is pulled, you have all three types of energy; potential, kinetic and elastic. Elastic as it has extension of the spring, potential energy as the mass is one meter above the ground level, and kinetic energy as the mass is in motion.

The following are the equations for calculating the different energies.

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.