A very long train is rolling at 4 m/s along a straight track. An observer is standing on the ground very dangerously close to the train as moves past notices a person standing on top of a car. When the person on the car is 300 m from the observer, the person begins running toward the observer at 6 m/s. A. Please write down the velocity vector equation for the person with respect to the ground.
B. How much time does the person take to reach the observer?

A.

B.  t = 50 s

Explanation:

A. The vectorial equation of the person who is getting closer to the other person is:

r: position vector

v: speed vector = 6m/s i  (if you consider the motion as a horizontal motion)

Then, you replace and obtain:

B. The time is:

d: distance to the observer = 300m

v: speed of the person on the car = 6.00 m/s

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

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.