Class Management I Help Homework 2 Begin Date: 1/17/2018 1200:00 AM-Due Date: 2/
ID: 1576570 • Letter: C
Question
Class Management I Help Homework 2 Begin Date: 1/17/2018 1200:00 AM-Due Date: 2/5/2018 11:59 00 PM End Date: 25/2018 11:5900 PM n high wi dow. The bottom of the wand is (11 %)Problem 7:A ball is thrown straight up from ground level. It passes a 2 m off the ground The time that elapes fom when the ball passes the bottom of the window on the way up, to when it passes the What was the ball's initial speed, in meters per second? Grade Summary Poteatial1 Submissions Anempts remain 4 5 6 cotan asin acos0 ata acotan sinh0 cos tanh0 cotanbo ed per attempt) ed detsiled view ed - Degrees Radians Submit I give up Feedback: deduction per feedback. Hints: 2 deduction per hist. Hints remaining 2 --Explanation / Answer
Solution :- Let's say the velocity at the bottom of the window was "v."
s = v*t + ½at²
2 m = v * 1.3s - 4.9m/s² * (1.3s)² = v * 1.3s - 8.3 m
v = 10.3m / 1.3s = 7.9 m/s
Then the initial speed was
V = (v² + 2as) = (7.9m/s² + 2 * 9.8m/s² * 7.5m) = 14 m/s initial velocity
(after rounding to 2 digits from 14.5 m/s).