SOLUTION: Please help me solve this word problem: If an object is propelled upward from a height of 128 feet at an initial velocity of 112 feet per second, then its height h after t secon

Question 132887: Please help me solve this word problem:
If an object is propelled upward from a height of 128 feet at an initial velocity of 112 feet per second, then its height h after t seconds is given by the equation h=-16t^2+112t+128. After how many seconds does the object hit the ground?
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Given :

When the ball hits the ground, the value of h is 0. So
divide through by 16

factor the equation

So, either -t+8 = 0 or (t+1) =0
possible answers are t = 8 and t = -1
Since t cannot be 'minus time', only t = 8 makes sense.
Answer t = 8 seconds
Verify the answer by plugging 8 into the original equation, solve and verify the result is 0.
RELATED QUESTIONS
Please help me solve this problem: If an object is projected upward with an initial... (answered by richwmiller)

please i need urgent help here. pleaseeeeeeeeeeee The height of an object propelled... (answered by vleith)

If an object is propelled upward from ground level with an initial velocity of 128 feet... (answered by htmentor)

Please help me solve this: If an object is projected upward with an initial velocity of... (answered by Alan3354)

An object is propelled upward from a height of 48 feet at an initial velocity of 64 feet... (answered by stanbon)

Help please If an object is propelled upward from a height of s feet at an initial... (answered by stanbon)

Height of a Projectile A projectile is fired straight upward from ground level with an... (answered by ankor@dixie-net.com)

If an object is propelled upward from a height of 96 feet at an initial velocity of 80... (answered by malaydassharma)

If an object is propelled upward from a height of 64 feet and initial velocity of 96... (answered by Alan3354)