Wednesday

July 23, 2014

July 23, 2014

Posted by **Rachelle** on Friday, April 20, 2012 at 7:49pm.

1. Write an equation describing the upward motion of the projectile.

***No air resistance.

***Let y represent altitude of the projectile (feet).

***let t represent time after firing in sec.

~~ 5200=-16t^2+340t+4500~~ IS THAT EQUATION CORRECT?

2. When, on the way up, might the projectile intersect the Red Baron? (THIS IS WHERE IM STUCK).

- Applying Algebraic Thinking to Data -
**Steve**, Saturday, April 21, 2012 at 5:57amsince we have no idea of the speed of the planes, we can only assume yu need to find when the height of the projectile is 5200 ft. Then ,if Snoopy is extremely lucky, he just might hit the Red Baron.

So, since your equation is correct, just solve

y = -16t^2+340t+4500

when y = 5200, as you showed above.

What's the problem? It's just a simple quadratic.

5200=-16t^2+340t+4500

-16t^2+340t-700 = 0

t = 5/8 (17 ± √177)

- Applying Algebraic Thinking to Data -
**Steve**, Saturday, April 21, 2012 at 5:59amat t = 5/8 (17 - √177) the missile is going up

at t = t = 5/8 (17 + √177) it is coming back down.

To see this, go to wolframalpha . com and type in

solve 5200=-16t^2+340t+4500

**Related Questions**

Physics - A projectile is fired straight up from a cliff which is 200 feet above...

Math - A projectile is fired straight up from a cliff which is 200 feet above ...

physics - a projectile is fired from the top of a building with an initial ...

Phoenix - Projectile motions problems are some of the most important problems ...

physics - A plane, diving with constant speed at an angle of 51.5° with the ...

Physics - Q Exactly 2.7s after a projectile is fired into the air from the ...

Physics - A projectile is fired with an initial speed of 31.0 at an angle of 10....

Physics - A projectile is fired with an initial speed of 28.0 m/s at an angle of...

PHYSICS - A Projectile IS FIRED FROM THE TOP OF A BUILDING WITH AN INITIAL ...

College Algebra - A projectile is thrown upward with an initial velocity of 272 ...