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Combine the equations W = mg and `s = 1/(2*g*t^2)` to give an equation for W which...

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minnsy229 | (Level 1) Honors

Posted June 20, 2012 at 6:56 AM via web

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Combine the equations W = mg and `s = 1/(2*g*t^2)` to give an equation for W which does not involve g.

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted June 20, 2012 at 7:03 AM (Answer #1)

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From the equations W = mg and `s = 1/(2*g*t^2)` an expression for W has to be created that does not contain g.

`s = 1/(2*g*t^2)`

=> `2g*t^2 = 1/s`

=> `g = 1/(s*2*t^2)`

Substitute this for g in W = mg

=> `W = m/(s*2*t^2)`

The required expression is `W = m/(2*s*t^2)`

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minnsy229 | (Level 1) Honors

Posted June 22, 2012 at 2:51 PM (Answer #2)

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The answer to this should have actually been 2ms/t^2

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