What will keep the gravitational force between two objects unchanged?

The gravitational force between two objects is determined by

-- the product of their masses, and

-- the distance between their centers.

If you want to keep the gravitational force between two objects unchanged, then you can make changes to the mass of one object, the mass of the other object, and the distance between them, BUT you have to be very careful to always keep the quantity

(one mass) x (the other mass) / (the distance)²

the same, unchanged number.  This means that if you change one thing, you'll have to change something else to keep that expression constant.

For example:  If one of the masses suddenly somehow becomes 4 times as great, then you can EITHER change the other mass to 1/4 of its original mass, OR move the two objects twice as far apart.

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.

well, you would divide 135 by 33 to get your answer. then that is how many seconds it would take. boardman should fly about 132 m or 4.090909090909091 seconds.