For each of the motions described below, determine the algebraic sign (positive, negative, or zero) of the x component and y component of velocity of the object at the time specified. For all of the motions, the positive x axis points to the right and the positive y axis points upward. A. Determine the algebraic sign of Alex's x velocity and y velocity at the instant he leaves the ground at the beginning of the jump. B. Determine the algebraic signs of Alex's x velocity and y velocity the instant before he lands at the end of the jump. C. Determine the algebraic signs of the ball's x velocity and y velocity the instant after it leaves the player's hands. D. Determine the algebraic signs of the ball's x velocity and y velocity at the ball's maximum height.

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.

their crystal patterns have been disrupted by stress

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle