Which of the following is the correct formula for calculating speed?
distance divided by mass
mass divided by volume
time divided by distance
distance divided by time

The formula used to calculate speed is distance divided by time.

Explanation:

Speed is defined as the rate of change of distance with respect to time.

The equation used to calculate speed of the object follows:

The S.I. unit of speed is meters per second (m/s)

For Example: A car traveled a distance of 200 meters in 5 second.

Hence, the formula used to calculate speed is distance divided by time.

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.