What was the acceleration during the segment labeled "a"?

Explanation:

As we know that the acceleration of an object is defined as the rate of change in velocity of the object

so we can say it is given as

so if we have a graph of velocity and time then rate of change in velocity is given by the slope of v-t graph

so here for segment A slope of the graph is

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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