dndfuf98 Posted March 17, 2017 Posted March 17, 2017 For #14 of the circular motion & rotation part of the AP style problems, for (c) why is the answer 2L/t instead of L/t? I don't understand why the L was doubled. Quote
0 FizziksGuy Posted March 17, 2017 Posted March 17, 2017 I'm assuming you're attempting to use v=d/t and coming up with L/t. Recall, though, that this formula gives you AVERAGE velocity. V_f is equal to 2*average velocity under constant acceleration, which you can provide by: v_0=0 v=? d=L a t=t Solve vf^2=v_0^2+2ad to get v_f=Sqrt(2aL) Solve d=v_o*t+.5*a*t^2 to get a=2L/t^2 Combine those two equations to eliminate a and solve for vf to show vf=Sqrt(4L^2/t^2)=2L/t Quote
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dndfuf98
For #14 of the circular motion & rotation part of the AP style problems, for (c) why is the answer 2L/t instead of L/t? I don't understand why the L was doubled.
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