Posted by peter on Tuesday, September 4, 2007 at 9:29pm.
why do communities need laws?
x = 1/2 a t^2 + v0 t + x0
and v = at + v0
(a)needs no translation, but some work: with v=12m/s, solve the velocity equation for the special time t (call it t) when the ball is at the window (in terms of 12m/sec and v0). Don't lose your nerve. Now plug that expression for the t1 into the x equation, with x equal to 27 m, and solve for v0.
(b) find the time, t2, when v=0 (That's at the top of the path.) plug that time into the position equation to find the x value at the highest point.
(c)Now that you know v0, return to the velocity equation in part a and solve for t.
(d)Use the position equation and ask "what time is it when x = 0?"
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