word problem for mathematics

Mathematics
Tutor: None Selected Time limit: 1 Day

a toy rocket is launched from a 2.8 m high platform in such a way that is height, h (meters), after t seconds is given by the equation h= -4.9t^2+18.9t+2.8 

how long will it take for the rocket to hit the ground?

May 20th, 2015

h= -4.9t^2+18.9t+2.8

2.8= -4.9t^2+18.9t+2.8

2.8-2.8= -4.9t^2+18.9t

-4.9t^2+18.9t=0

-4.9t^2=-18.9t

t= 18.9/ 4.9

t= 3.85 sec



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best of luck

May 20th, 2015

round to the nearest hundredth 

May 20th, 2015

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