Another Word Problem

[InNeedOfHelp!]

Use the formula h=vt-16^2.

An object is fired into the air with a velocity of 72 feet per second. How many seconds will it take for the object to hit the ground?

 

[kmgmn]

Use the formula h=vt-16^2.

An object is fired into the air with a velocity of 72 feet per second. How many seconds will it take for the object to hit the ground?

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To solve this example, first substitute the value for the velocity into the formula, and let h = 0 (the height at ground level).

h = vt - 16^2
0 = 72t - 16^2

Square 16, which equals 256.

0 = 72t - 256
Add 256 to both sides to get the equation: 256 = 72t
Divide both sides by 72.
t ~ 3.56 sec, rounded to the nearest hundredth.

 

[Mrspi]

Use the formula h=vt-16^2.

An object is fired into the air with a velocity of 72 feet per second. How many seconds will it take for the object to hit the ground?

Are you sure you typed the formula correctly?? I think it should be

h = vt - 16t<SUP>2</SUP>

Substitute 0 for h, and 72 for v:

0 = 72t - 16t<SUP>2</SUP>

You can factor the right side by removing a common factor of t from both terms. Then, set each factor equal to 0 and solve for t.