solving a word problem using a quadratic equation with irrational roots

Mathematics
Tutor: None Selected Time limit: 1 Day

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
Dec 9th, 2016
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