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October 21, 2014

October 21, 2014

Posted by **elaine** on Tuesday, October 19, 2010 at 8:54pm.

- physics -
**Henry**, Thursday, October 21, 2010 at 12:38pma. d = 0.5gt^2,

75 = 0.5 * 9.8t^2,

75 = 4.9t^2,

Divide both sides by 4.9:

t^2 = 75 / 4.9 = 15.3,

t = sqrt(15.3) = 3.9 s.

b. d = Vo*t + 0.5gt^2,

Vo*t = 15 m,

75 = 15 + 0.5 * 9.8t^2,

75 - 15 = 4.9t^2,

60 = 4.9t^2,

Divide both sides by 4.9:

t^2 = 60 / 4.9 = 12.2,

t = sqrt(12.2) = 3.5 s.

c. Vo*t = 15,

Vo * 3.5 = 15,

Vo = 15 / 3.5 = 4.3 m/s.

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