In which situation is no work being done A person carrying a box from one place to another a person picking up a box from the ground

A person picking up a box from the ground

Explanation:

Work is defined as measure of energy transfer that occurs when an object is moved from one place to another by an external force at least part of which is applied in the direction of the displacement. Basically, work implies activity whether an activity done by body, of mind, of a machine, or of a natural force. In picking up a box from the ground there is no movement of person from one palce to another, hence no work done by him. Work is done only when he picks the box and moves from one point to another while carrying it.

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.

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more