Saturday

August 23, 2014

August 23, 2014

Posted by **HM** on Thursday, September 29, 2011 at 11:28am.

The position of an object moving in a straight line is give by s=2t^2-3t, where is s in metres and t is the time in seconds the object has been in motion..

how long will it is take the object to move 6 meters?

I first used the simplfying rule but it did not work.. Then I used the vertex formula and I got a 2.5 from which I got a negative number..

Moreover then I used the quadratic formula and I got a 2.6 which I put in the formula of 2t^2-3t and I got a 5.7

Where am I going wrong?

The true answer is 2.6 seconds.

- College Math -
**bobpursley**, Thursday, September 29, 2011 at 12:01pms=2t^2-3t

2t^2-3t-6=0

t= (3+-sqrt(9+48))/4=3/4 +-(sqrt57)/4

in my head t= .75+-7.5/4=.75+-about 1.8

= about 2.6seconds So recheck your quadratic formula solution

- College Math -
**HM**, Thursday, September 29, 2011 at 12:12pmAha, how silly of me!

My answer were absolutely correct, which was 2.6.. I don't know what urged me to go ahead and put it in the formula again..

Thank you for reconfirming my stupidity.

**Related Questions**

Calculus-derivatives - Explain how to do these questions~ 1. An object moves in ...

math - the position of an object moving in a straight line is given by s=...

math - The position of an object moving in a straight line is given by the ...

Algebra - Can someone help me? Do I subtract 17 on both sides and then...

urgent calculus - The position of a particle moving in a straight line is ...

physics HELP!! - An object is moving along a straight line, and the uncertainty ...

physics - An object is moving along a straight line, and the uncertainty in its ...

Physics - This question has to do with kinematics graphing. I CAN NOT REPRODUCE ...

physics # 1 - 1. If a particle moves in a plane so that its position is ...

Physics please help! - An object is moving along a straight line and the ...