SOLUTION: I know this is a quadratic equation(word problem)I just can't make it work. This is the last algebra problem I hope to have. If a stone is tossed from the top of a 250 meter bui

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Question 622025: I know this is a quadratic equation(word problem)I just can't make it work. This is the last algebra problem I hope to have.
If a stone is tossed from the top of a 250 meter building, the height of the stone as a function of time is given by h(t)= -9.8t^2 - 10t + 250, where t is in seconds, and height is in meters. After how seconds will the stone hit the ground? Round to the nearest hundreths place.
Thanks so much

Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

by h(t)= -9.8t^2 - 10t + 250, where t is in seconds, and height is in meters. 

Hits the ground, then h =0

  -9.8t^2 - 10t + 250 = 0

 

 

throwing out negative solution for time

 t = 4.566sec

 

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