Question

An object is launched from an initial height of 5 feet and initial upward velocity of 65 feet per second. Which of the following could be used to determine at what times the object's height is less than 50 feet? [Let t represent time.]

-16t2 + 5t + 65 < 50
-16t2 + 65t + 5 > 50
-16t2 + 5t + 65 > 50
-16t2 + 65t + 5 < 50
Do yall know the answer?

Answer 1

B or C I believe. Your choice.

Answer 2

Thanks..

Answer 3

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Answer 4

Its not C
Its not B because you want the tiems where its LESS then 50 feet. Not More then
It's D because the formula for projectile motion is
h=-16T^2 + VoT+So
Height = -16Time^2+Initial Velocity*Time+Initial Height.

Answer 5

And you want it less then 50 feet.