Question

A retired math teacher is golfing with his friend, a retired physics teacher. He hits a ball with a velocity of 70 feet per second. Unfortunately, the ball lands in a sand trap with an elevation 9 feet lower than the retiree's starting point. The physics teacher says the ball's elevation can be represented by the expression - 16x2 + 70x +9, where a represents the amount of time the ball is airborne, - 16 represents the acceleration due to gravity, and 9 indicates the elevation of the starting point 9 feet above the ending point. Which statements are true about this situation? Select ALL that apply. Elimination Tool A The ball is airborne for 0.125 seconds. B The ball is airborne for 4.5 seconds. С When the ball has landed, it is 9 feet lower than before, so 9 is a zero of the equation. D When the ball has landed, its elevation will be o, so the time it takes to land is a zero of the equation. E It takes 0.129 seconds for the ball to reach the sand trap. F When the ball is first hit, its elevation is 0, so this position represents a zero of the equation.

Answer 1

elevation of ball - 16n² + rontg n amount of time the ball is airborne when ball is hit first then n=0 so h -16.(0) + 70 (0) +9 at no [h=g feet ball's elevation is g feet hits sand trap then starting point so In=o at at sand -trap that given it when it is g feet and lower then option D so at sand trap - 16 n²+rou + g = o 1601²-701 - 9=0 70 - ugoo+576 r = 32 2 70 1 5476 32 N 70 74 32 4.5 x = x = – 0.125 to but time is always positive x = 4.5 Sec. so ball is airborne for 4.5 seci B option B and option D