Calculate the average time the car took to reach each checkpoint. Record the average time in Table D of your
Student Guide.
The average time to the first quarter checkpoint is
seconds
The average time to the second quarter checkpoint is
seconds.
The average time to the third quarter checkpoint is
seconds
The average time to the finish line is seconds

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.

b.

explanation:

unlike poles attract