A hobby store prices model train track using a proportional relationship between the length of track (in inches) and the cost in
dollars.
If 6.4
6
.
4
inches of track costs $16
$
16
, what is the constant of proportionality?
If 6.4
6
.
4
inches of track costs $16
$
16
, what is the constant of proportionality?
2 answers:
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Answer:
The ball will take 4.05 seconds to hit the ground.
Step-by-step explanation:
we have
This is a quadratic equation (vertical parabola) open down
The vertex is a maximum
we know that
The ball hit the ground when h=0
Solve the quadratic equation
For h=0
The formula to solve a quadratic equation of the form
is equal to
in this problem we have
so
substitute in the formula
---> the time cannot be a negative number
therefore
The ball will take 4.05 seconds to hit the ground.