Friday

December 19, 2014

December 19, 2014

Posted by **rudy** on Sunday, April 27, 2008 at 11:35pm.

s=t3–2t2–6t t> or equal to 0

where s is measured in meters and t in seconds. When does the particle reach a velocity of 7 m/s?

- math -
**Reiny**, Monday, April 28, 2008 at 12:09amds/dt = 3t^2 - 4t - 6

so when ds/dt = 7

3t^2 - 4t - 6 = 7

3t^2 - 4t - 13 = 0

Solve using the quadratic equation, and use the positive answer.

(I got 2.85 sec)

- math -
**stephen**, Thursday, November 22, 2012 at 10:18pmif Iam driving a car at 100km / hr and my reaction time is 0.382 seconds.

with many thanks Stephen

**Answer this Question**

**Related Questions**

Math Check - Solve the inequality. So i have done this problem at least three ...

Math - A manufacturer estimates that the profit P from producing x units of a ...

Math(Please help) - Write the equation of the tangent line for the curve y=x^3+...

derivative - 41) Find the derivative. h(x)= (3x^2 + 1)^3 / (x^2 - 1)^4 This is ...

Math(Please help) - Logarithmic differentiation f(x)=(2x-1)^-2 (x+3)^4 at x=1 f...

Math(Please help) - Related Rates: Gas is escaping from a spherical balloon at ...

Calculus - Find f'(c) if f(x)=-3e^(x+2)+ e^(-5) [NOTE:A small algebraic ...

Math check 3 - f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15). I ...

algebra1/McDougal Littell - Is this problem correct?I'm trying to solve the ...

Calc - I'm trying to write an equation for all the infinite values of the ...