Explain why 17,18,19 are incorrect and the correct answer

ions 17 and 18: ee identical blocks each take a different path from AVO = 0 VO= V eight h to the ground. Block A is released from rest and falls vertically. Block B is released from rest and slides down a frictionless incline. Block C is projected horizontally with an initial speed of v. 17. Which block takes the longest time to reach the ground? (A ) A B) B (D) The blocks take the same time to reach the ground. 18. Which block has the greatest speed just before hitting the ground? ( A) A ( B ) B (C ) C (D) The blocks reach the ground with the same speed. 19. A 9.0-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m. A constant frictional force, introduced at point A, oranges brings the block to rest at point B, 19 m to the right of point A. What is the coefficient of kinetic friction, My, of the surface from A to B? 5.0 m (A) 0.26 (B) 0.33 (C) 0.47 - 19 m (D) 0.52