A 61 kg person is in a head-on collision. The car's speed at impact is 14 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.

Explanation:

It is known that the relation between force and acceleration is as follows.

                F = -ma ............ (1)

Also,    acceleration (a) = ......... (2)

The given data is as follows.

                 v = 0,          u = 14 m/s,    s = 1

Therefore, putting the values of expression (2) into expression (1) as follows.

                F =

                   =

                   = 5978 N

thus, we can conclude that net force on the person if he or she is wearing a seat belt and if the air bag deploys is 5978 N.

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.

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms