Originally posted by Krusher
I saw a better one.
Its not a racist slam at Secretary Rice. nooooo, not at all.
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The following sample math problem was given to students as part of their final exam at Bellevue Community College in Washington State.
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Condoleezza holds a watermelon just over the edge of the roof of the 300 -foot Federal Building, and tosses it up with a velocity of 20 feet per second. The height of the watermelon above the ground t seconds later is given by formula h= -16t2 + 20t + 300
a. How many seconds will it pass her (she's standing at a height of 300 feet) on the way down?
b. When will the watermelon hit ground?
Since it's considering the height 300 to be "ground zero," we need to figure when h = 300 for the first problem.
300 = -16t^2 + 20t + 300 NOTE the caret. You forgot to include that.
It's 300 at t = 0 (the start)
Using the commutative law:
0 = -16t^2 + 20t
16t^2 = 20t
16t^2/t = 20
16t = 20
t = 20/16
t = 5/4
Plugging it back in to the original equation:
h = -16(5/4)^2 + 20(5/4) + 300
h = -16(25/16) + 100/4 + 300
h = -25 + 25 + 300
h = 300
So 5/4ths of a second after she tosses it it will pass her.
The time it takes to hit the ground is the summation of the time it takes to go up, and come down.
I might work on this later.