I am mind fkd after seeing this equation(after paragraph 2) change so many times. And the second paragraph doesn't make any sense to me. can someone please explain it?
Can you be more specific about what confuses you? It's ok to quote the books.
The paragraph (at least in my book, with the blue cover, 2009 edition that I bought late last year) is about applying algebra to factor out time in the translational motion equation y = (initial velocity)(time) + (1/2)at^2.
Algebra, and the logic that y = 0 when the ball is on the ground.
The question which asks to find T_f_. I don't get it because it says to use equation 1.18 ∆y=v_oy ∆t+1/2 a_y (∆t^2) . And how the heck does this equation change from this to t=2v_o/g ? I feel like this paragraph is all riddled up.
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