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The function y=-16t^2+8t represents the height y (in feet) of a grasshopper jumping straight up from the ground t seconds after the start of the jump. After how many seconds is the grasshopper 1 foot off the ground?

 Jan 8, 2019

Best Answer 

 #1
avatar+18346 
+2

You want to solve the given equation for y = 1

 

1=-16t^2+8t    re-arrange

-16t^2+8t-1 = 0    solve for t using quadratic formula    a = -16   b = 8  c = -1

 

t= 1/4 sec

 Jan 8, 2019
 #1
avatar+18346 
+2
Best Answer

You want to solve the given equation for y = 1

 

1=-16t^2+8t    re-arrange

-16t^2+8t-1 = 0    solve for t using quadratic formula    a = -16   b = 8  c = -1

 

t= 1/4 sec

ElectricPavlov Jan 8, 2019

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