SOLUTION: not in book.
Use the formula h=-16t^2+250t to model the height h in feet of a model rocket t seconds after it is launched.Determine when the rocket will reach a height of 900 fe
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Use the formula h=-16t^2+250t to model the height h in feet of a model rocket t seconds after it is launched.Determine when the rocket will reach a height of 900 fe
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Question 80468: not in book.
Use the formula h=-16t^2+250t to model the height h in feet of a model rocket t seconds after it is launched.Determine when the rocket will reach a height of 900 feet.
Help please. Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! Use the formula h=-16t^2+250t to model the height h in feet of a model rocket t seconds after it is launched.Determine when the rocket will reach a height of 900 feet.
:
Substitute 900 for h:
:
-16t^2 + 250t = 900
:
-16t^2 + 250t - 900 = 0; a quadratic equation
:
Use the quadratic formula: a=-16; b=250; c=-900
:
do the math and you should get two positive solutions giving us the times when
rocket will be at 900 ft:
:
t = 5.625 sec (on the way up) and t = 10 sec (on the way down
