The Time Required for a Dropped Object to Hit the Ground

Multiple Choice

The time required for a dropped object to hit the ground is given by $t = \sqrt { \frac { 2 h } { g } }$ , where h is the vertical distance traveled and g is the acceleration due to gravity (32.2 feet per second squared) . How long will it take an object to fall from the top of the Torre Commercial America, in Monterrey, Mexico at 427 feet tall? Round the answer to the nearest tenth.

A) t = 26.5 sec.
B) t = 5.1 sec.
C) t = 10.9 sec.
D) t = 5.7 sec.
E) t = 6.4 sec.