Solving for t

1. Sep 2, 2007

kurosaki69

1. The problem statement, all variables and given/known data

0=−(4.90 m/s^2)t^2 -(8.00 m/s)t + 30m
i am asked to solve for x but having problems
2. Relevant equations

3. The attempt at a solution

2. Sep 2, 2007

bel

There's no "x" in the equation, but if you are solving for "t", use the quadratic equation.

3. Sep 2, 2007

4. Sep 2, 2007

kurosaki69

k thanx but im still kind of stuck is -8.00t b and -4.90 a and 30 c. for the quadratic formula

5. Sep 2, 2007

bel

The determinant of the second degree equation is positive, which thereby yields two distinct real roots.

6. Sep 2, 2007

kurosaki69

im sorry but can u explain that simplier

7. Sep 2, 2007

bel

Well, the thing inside the radical sign, it is positive, sqrt((-8.00)^2-4*(-4.90)(30))=sqrt(652), which is real.

8. Sep 2, 2007

kurosaki69

thanks a bunch