February 21, 2017

Homework Help: College Math

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

Another question which is confusing.

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.

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