Monday

March 2, 2015

March 2, 2015

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

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

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

- Calculus -
**Reiny**, Tuesday, June 15, 2010 at 11:00pmv(t) = -9.8t + 28

we want this to be -28 (negative for downwards)

-9.8t + 28 = -28

-9.8t = -56

t = -56/-9.8 = 5.7 seconds

**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...