Solve the Problem $h = 464 - 16 t ^ { 2 }$

question 494

Multiple Choice

Solve the problem.
-A rock falls from a tower that is 464 feet high. As it is falling, its height is given by the formula $h = 464 - 16 t ^ { 2 }$ How many seconds (in tenths) will it take for the rock to hit the ground (h = 0) ?

• A) 5.4 sec
• B) 21.2 sec
• C) 13,456 sec
• D) 21.5 sec

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