Question

Josh hit a baseball, and the flight of the ball was modeled by the following equation:
h = -16t2 + 78t + 4. After how many seconds will the ball fall to the ground if it is not caught? Round your answer to the nearest tenth.

Answer 1

When the ball falls to the ground, h=0

So the question becomes solving -16t^2 + 78t +4 = 0 and t must be 0...

Answer 2

ops typo: it should read "t must be > 0"

Answer 3

Josh hit a baseball, and the flight of the ball was modeled by the following equation:
h = -16t2 + 78t + 4. After how many seconds will the ball fall to the ground if it is not caught? Round your answer to the nearest tenth.





A.




4.7 seconds



B.




4.8 seconds



C.




5.0 seconds



D.




4.9 seconds

Answer 4

those are the options confusing to me :?

Answer 5

No need to be confused...just solve the quadratic eqn:

-16t^2 + 78t +4 = 0

n u should get the right ans.