Imagine a skateboarder rolling down a hill. Draw a force diagram of the skateboarder. Assume for now that there is no friction between the skateboard and the hill. Try to add two more force vectors to your force diagram that break the force of gravity into components parallel to and perpendicular to the ramp surface. Add second a force to your force diagram, this time directed parallel to the ramp surface but pointed up the ramp. Make the magnitude of the force such that it that would cause the skateboarder to move with constant velocity.
answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.
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.