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Posted by **Tally** on Thursday, August 11, 2011 at 10:02am.

- physical science 101 -
**Henry**, Thursday, August 11, 2011 at 7:04pma. d = Vo*t + 0.5at^2 = 40m,

0 + 0.5 * 9.8 * t^2 = 40,

4.9t^2 = 40,

t^2 = 8.16,

t = 2.86s.

b. Vf^2 = Vo^2 + 2gd,

Vf^2 = 0 + 2 * 9.8 *40 = 784,

Vf = 28m/s.

- physical science 101 -
**Jessica**, Sunday, January 29, 2012 at 7:55pmA) h=0.5gt^2

40=0.5(9.8)(t^2)

40=4.9t^2

t^2=8.16

t=2.86s

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