A 70 kg mass is on the edge of a cliff and falls 40 meters before striking a surface where it stops. What is its potential energy? How much kinetic energy does the mass have just before it strikes the surface? What is the velocity of the mass just before it strikes the surface? How much momentum does the mass have just before it strikes the surface?

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.

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