SOLUTION: When a ball is thrown into the air, its height depends on the time since the ball was thrown. The equation for its height is h=-t raised to the power 2 + 2t + 3. Find the greatest

Question 728772: When a ball is thrown into the air, its height depends on the time since the ball was thrown. The equation for its height is h=-t raised to the power 2 + 2t + 3. Find the greatest height attained by the ball.
A. 1 foot
B. 4 feet
C. 5 feet
D. 3 feet
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!

because
The greatest height attained by the ball is

NOTE: The answers give the units as feet.
The problem does not say what the units for are.
It could not be feet or meters if it was on Earth, because the acceleration of gravity om Earth is 9.8 m/s^2 or 32 ft/s^2.
As a former (substitute) Physics teacher, I am puzzled.
If this happened on planet Earth the equation would be
+ ... for in meters, or
+ ... for in feet.
The in the problem is in some fancy alternate units, or else it did not happen on Earth.
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