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October 21, 2014

October 21, 2014

Posted by **Anonymous** on Friday, February 1, 2013 at 8:10pm.

- physics -
**Henry**, Sunday, February 3, 2013 at 8:29pmV^2 = Vo^2 + 2g*d.

Vo^2 = V^2--2g*d

Vo^2 = 0 - (-19.6)*20.6 = 403.76

Vo = 20.1 m/s. = Initial velocity.

V = Vo + g*t.

Tr = (V-Vo)/g = (0-20.1)/-9.8 = 2.05 s.

= Rise time.

Tr + Tf = 6.54 s.

2.05 + Tf = 6.54

Tf = 6.54 - 2.05 = 4.49 s. = Fall time

from 20.6 m above the cliff to Gnd.

Vo*t + 0.5g*t^2 = 20.6 + h.

0 + 4.9t^2 = 20.6 + h

h = 4.9*(4.49)^2 - 20.6 = 78.2 m.

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