ejbkewhjvdhwevh ejbkewhjvdhwevh
  • 03-12-2017
  • Mathematics
contestada

Just need help with A and B

Just need help with A and B class=

Respuesta :

tynollette tynollette
  • 03-12-2017
return to the ground means h is 0:
0=-16t²+220t
-16t(t-13.75t)=0
t=0 or t=13.75
t=0 is when the rocket is launched, t=13.75 is when the rocket returns to the ground.

b. 756=-16t²+220t
16t²-220t+756=0
use the quadratic formula to solve: t= [tex] \frac{220+4}{32} or \frac{220-4}{32} [/tex]
so t=7 or 6.75 second
That makes sense because at 6.75 seconds the rocket is at 756 feet going upward, it reaches the highest point, then at 7 seconds it is at the same height of 756 feet coming down. 
Answer Link

Otras preguntas

What is the volume of a 86.8 gram Piece of aluminum? The density of aluminum is 2.70g/mL.
Starch is an example of? A) lipid B) sugar C) carbohydrate D) proteins
What type of adaptation do most plants use?
3. Multiply and simplify: (4x + 3)(x - 1) Answer =
write the seven tasks of previntng maintenance?​
Please help me I'm failing and I'm so confused!!!!!!!
If you have an integer on a number line, that we’ll refer to as ‘x’, what would you call the next consecutive number on the number line? ​
An ant crawls 14 cm down into an ant hole. It then crawls 6 cm up to the queens nest. What is the current location of the ant?
Take another look at this source. Choose the right word or phrase to complete the sentence. The codes made it possible for white people to force children into
it b (3-3) if you can't see heeeellllpppppp meeeeee​