Posted by **Anonymous** on Tuesday, June 15, 2010 at 10:26pm.

A fireworks shell is shot upward with an initial velocity of 28m/s from a height of 2.5 m.

s(t) = -4.9t^2 + 28t + 2.5

After how many seconds will the shell have the same speed, but be falling downward?

## Answer this Question

## Related Questions

- science - a shell is fired from the cannon. the shell of mass 30kg is shot with ...
- Physics - A 2.50 kg fireworks shell is fired straight up from a mortar and ...
- physics - A cannon fires a shell straight upward; 2.4 s after it is launched, ...
- Physics - A cannon fires a shell straight upward; 2.1 s after it is launched, ...
- calculus - 3) A shell is fired from ground level with a muzzle speed of 350 ft...
- calculus I - the height (in meters) of a projectile shot vertically upward from ...
- physics - An artillery shell is launched on a flat, horizontal field at an angle...
- physics - An artillery shell is launched on a flat, horizontal field at an angle...
- phsics - An artillery shell is launched on a flat, horizontal field at an angle ...
- physics - An artillery shell is launched on a flat, horizontal field at an angle...

More Related Questions