Question

i give medals and fans

Answer 1

If a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? Use the equation \[h=-16t ^{2}+64t+4\]

Answer 2

baseball hits the ground when \(h=0\).

Answer 3

ok

Answer 4

@Shadowys @UnkleRhaukus @TSwizzle can you help me please

Answer 5

\(h=-16t^2 +64t +4\)
when h=0,(the ball hits the ground)
\(0=-16t^2 +64t +4\)
use the general formula. what did u get?

Answer 6

you need to solve the quadratic equation
since h=0
so
-16t^+64t+4=0
or
16t^2-64t-4=0
use quadratic formula with
a=16
b=-64
c=-4
you will get two roots
t=4 sec
t=-0.6
but time cannot be negative so neglect the negative value
t=4 sec is the required time .

Answer 7

\[\frac{ -64\sqrt{64^{2}+16*-4} }{ 2*16 }\]
\[\frac{ -64\sqrt{64^{2}-64} }{ 32 }\]

Answer 8

it should be +64 outside the root because b=-64 and there is minus in the formula too .

Answer 9

note: it's \(-64 \pm \sqrt{64^2 - (4)(-16)(4)}\) up there.

Answer 10

correct formula is
\[\Large =\frac{-b \pm \sqrt{b^2-4ac}}{2a}\]

Answer 11

\[\frac{ 64\sqrt{64^{2}+256} }{32}\]

Answer 12

you miseed plus minus sign :)

Answer 13

yup! simplify and you're done (i guess the editor don't have it. the latex is \pm