What type of energy is stored in the spring of a watch?

Explanation:

Elastic potential energy is a kind of potential energy stored as a result of deformation of an elastic object, such as stretching or compressing of rubber bands ,springs and bungee cords . The more an object is stretched , more is its elastic potential energy . ln spring based watch , mainspring powers the watch.

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.