Homework Help: Physics

Posted by Marissa on Friday, August 31, 2012 at 6:47am.

Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are different. Suppose that the initial speed of the first arrow is 34.7 m/s and that the second arrow is fired 1.55 s after the first. Determine the initial speed of the second arrow.

Physics - Henry, Monday, September 3, 2012 at 12:15am
First Arrow.
Tr = (Vf-Vo)/g = (0-34.7) / -9.8=3.54s.
+ Riswe time.

hmax = (Vf^2-Vo^2)/2g.
hmax = (0-1204.1) / -19.6 = 61.4 m.

2nd Arrow.
Vf = Vo + gt.
Vo = Vf - gt
Vo = 0 - (-9.8)(3.54-1.55) = 19.5 m/s.

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