##### solving a word problem using a quadratic equation with irrational roots

label Mathematics
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A ball is thrown from an initial height of
meter with an initial upward velocity of
. The ball's height
(in meters) after
seconds is given by the following.
Find all values of
for which the ball's height is

meters.

Apr 30th, 2015

please post the question correctly........not able to get anything.......

Apr 30th, 2015

A ball is thrown from an initial height of

1

meter with an initial upward velocity of

25/ms

. The ball's height

h

(in meters) after

t

seconds is given by the following

H=1+25t-5t^2

Find all values of

t

for which the ball's height is

6

meters.

Apr 30th, 2015

so the quadratic equation is H=1+25t-5t^2

we have to find all values of t for h=6meters

so,6=1+25t-5t^2

0=-5+25t-5t^2

5t^2-25t+5=0

t^2-5t+1=0

solving we get

t1=4.79

t2=0.208

Apr 30th, 2015

could you help me set it up to get the right number for the square root cause i got -751 with positive 38 but with -38 i got 769 i confuse my signs when im supposed solve the 4*ac part

A ball is thrown from a height of

38

meters with an initial downward velocity of

3/ms

. The ball's height

h

(in meters) after

t

seconds is given by the following.

h=38−3t-5t2

How long after the ball is thrown does it hit the ground?Round your answer(s) to the nearest hundredth.

Apr 30th, 2015

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Apr 30th, 2015
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Apr 30th, 2015
Oct 20th, 2017
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