SOLUTION: How long would it take for a ball dropped from the top of 400 foot building to hit the ground? Round your answer to two decimal places. Use Gravity formula

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Question 562522: How long would it take for a ball dropped from the top of 400 foot building to hit the ground? Round your answer to two decimal places.
Use Gravity formula
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+x%28t%29+=+-16t%5E2+%2B+400+
Note that:
+x%280%29+=+-16%2A0+%2B+400+
+x%280%29+=+400+ ft
This just says that at +t+=+0+,
the ball is +400+ ft above ground
------------
I need to find when the ball is at the
ground, or when +x+=+0+
+0+=+-16t%5E2+%2B+400+
+16t%5E2+=+400+
+t%5E2+=+400%2F16+
+t%5E2+=+25+
+t+=+sqrt%2825%29+
+t+=+5+ sec