Question

d) zero, vertical downward. e) zero, horizontal. 10. In ideal projectil the x-component of the velocity of the object during the ascending part of the e motion, when the positive x-axis is chosen to be horizontally rightward, motion and the x- component of the velocity during the descending part of the motion are, respectively a) positive, negative. b) negative, positive. c) positive, positive. d) negative, negative. 11. In ideal projectile motion, when the positive y-axis is chosen to be vertically upward, the y- component of the velocity of the object during the ascending part of the motion and they component of the velocity during the descending part of the motion are, respectively, a) positive, negative. b) negative, positive. c) positive, positive. d) negative, negative. 12. The figure shows the path of a tennis ball your friend drops from the window of her apartment and of the rock you throw from the ground at the same instant. The rock and the ball collide at x 50.0 m,y - 10.0 m and t 3.0 s. If the ball was dropped from a height of 54.0 m, determine the velocity of the rock initially and at of its collision with the ball x.

Answer 1

10) positive, positive

Both the time x-component of the velocity will be positive because during the whole positive motion the X component of the velocity is towards right and even constant as the object is moving in rightward dorection and only the v component of the velocity changes.