solving 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. H=1+25t-5t^2

Find all values of 

 for which the ball's height is 

 meters.

Apr 30th, 2015

h=1+25t-5t^2

v=25-10t....velocity equation

maximum height v=0

t=2.5 seconds

substituting

h=1+62.5-5*6.25

solving

63.5-31.25

32.25 meters  answer

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.


 the question was not entered fully

Apr 30th, 2015
Apr 30th, 2015

thanks a lot..................look forward to working with you.

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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