Suppose you walk 18.0 m straight west and then 25.0 m straight north, how far are you from your starting point? answer

Solution:

Since the directions are perpendicular,

So we must use Pythagoras theorem:  

d = √(18.0² + 25.0²) m = 30.8 m

Thus,  

This the required distance from the starting point.

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.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s