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November 20, 2014

November 20, 2014

Posted by **tina** on Sunday, January 31, 2010 at 7:58pm.

- college physics -
**tina**, Sunday, January 31, 2010 at 8:01pm(-15.0)-(1/2)(-9.80)(.96)/.96 answer equals .10.7

- college physics -
**Damon**, Sunday, January 31, 2010 at 8:05pmTina - I did this problem for Brittany, scroll down.

- Here Again -
**Damon**, Sunday, January 31, 2010 at 8:07pmfirst get time to fall to ground

a = -9.8

v = -9.8 t

-15 = -4.9 t^2

t = sqrt (15/4.9) = 1.75 seconds

-------------------------------

Now how long did it take to reach 3.1 m down

3.1 = -4.9t^2

t = .795 seconds

---------------------------------

so the second rock spends 1.75 -.795 or .955 seconds in the air

-15 = Vo (.955) -4.9 (.955)^2

.955 Vo = 3.64-15

Vo = - 11.9

so 11.9 m/s downward (negative)

- college physics -
**Camrik**, Tuesday, September 6, 2011 at 7:40pmwrong answer -4.9(.955)^2 does not equal 3.64

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