the formula S=16t^2 is used to approximate the distance S, in feet, that an object falls freely from the rest in t seconds. The height of a building is 1278 feet. How long would it take for an object to fall from the drop?

Question

mertsj · Answer

Replace s with 1278 and solve for t

anonymous · Answer

i got -3/4 square root of 143 and postive 3/4 square root of 143 ??? but the answering im looking for is suposed to be a decoimal

anonymous · Answer

decimal

anonymous · Answer

???

anonymous · Answer

i got -3/4 square root of 143 and postive 3/4 square root of 143 ??? but the answering im looking for is suposed to be a decoimal

mertsj · Answer

$$1278=16t^2$$
$$79.875=t^2$$
t=8.9

anonymous · Answer

no thats not right

mertsj · Answer

Then what is the answer?

anonymous · Answer

i dont know but i triedthat and it didnt work.

anonymous · Answer

did you mean the answer is 8.9 times 8.9

mertsj · Answer

Maye you need more decimal places.  How about 8.94 or 8.937

mertsj · Answer

No.  The answer is 8.9

anonymous · Answer

wow it was 9.0 that was my fault. can u help with a similar one? S=16t^2   1479 feet

anonymous · Answer

wow it was 9.0 that was my fault. can u help with a similar one? S=16t^2   1479 feet

mertsj · Answer

same thing.  1479=16t^2
Divide both sides by 16 and take the square root of that answer.

anonymous · Answer

i got 9.6

mertsj · Answer

Me too.

anonymous · Answer

Can you help me with another question?

mertsj · Answer

post it

anonymous · Answer

a 15 ft long ladder leans on a wall, the bottom of the ladder is 9 ft from the wall.if the bottom is pulled out 4 ft farther from the wall, how far does the top of the ladder move down the wall

anonymous · Answer

round to the nearest thousanth as needed

mertsj · Answer

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mertsj · Answer

Use the Pythagorean theorem to find x

mertsj · Answer

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