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.