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April 21, 2014

April 21, 2014

Posted by **Alysha** on Friday, September 9, 2011 at 6:58pm.

- physics -
**Henry**, Sunday, September 11, 2011 at 7:01pmVo = 20.4m/s @ 41 deg.

Xo = 20.4cos41 = 15.4m/s

Yo = 20.4sin41 = 13.4m/s.

Vf^2 = Vo^2 + 2gd,

d = (Vf^2 - Vo^2) / 2g,

d(up) = (0 - (13.4)^2) / -19.6 = 6.84m,

d = Vo*t + 0.5gt^2 = 6.84m.

0 + 0.5*9.8t^2 = 6.84,

4.9t^2 = 6.84,

t^2 = 1.396,

t(down) = 1.18s.

V = d/t = 42.2 / 1.18 = 35.8m/s.

- physics -
**Henry**, Sunday, September 11, 2011 at 7:21pmCorrection:

t(up) = (Vf - Vo) / g,

t(up) = (0 - 13.4) / -9.8 = 1.37s.

T = t(up) + t(down),

T = 1.37 + 1.18 = 2.55s.

V = d/T = 42.2 / 2.55 = 16.5m/s.

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