Wednesday

October 1, 2014

October 1, 2014

Posted by **Joe** on Tuesday, January 8, 2013 at 8:37am.

- Calc -
**Reiny**, Tuesday, January 8, 2013 at 9:03amYou are using the wrong units, the value of -10 is associated with metres not feet. (actually in most cases it is considered -9.8 )

I will assume you meant metres, not feet

height = -5t^2 + 40t

velocity = -10t + 40

at max height, velocity = 0

-10t+40 = 0

t= 4

height = -5(4^2) + 40(4) = 40 m

If your problem stated feet, then the equation would have been

height = -16t^2 + 40t

etc

**Answer this Question**

**Related Questions**

calculus - use a(t) = -32 ft per second squared as the acceleration due to ...

calculus - A stone is thrown straight down from the edge of a roof, 750 feet ...

Applied Calculus - Suppose that an object is thrown down towards the ground from...

math - A stone is thrown straight up from the edge of a roof, 700 feet above the...

calculus - A ball is thrown vertically upwards from a height of 6 ft with an ...

Algebra - THe function h(t)=-16t^2+v0t+h0 describes the height in feet above the...

Algebra - THe function h(t)=-16t^2+v0t+h0 describes the height in feet above the...

Pre Calculus - If you are riding on a Ferris wheel that is 60 feet tall and it ...

college algebra - Isn't this a plug and chug? I will be happy to critique your ...

algebra - y=(v/u)x+(g)/(2(u^2))*x^2 where y is the object's vertical distance (...