Posted by **maddy** on Sunday, May 26, 2013 at 9:39pm.

if a rock is dropped from the top of a 200 ft building, solve for the time it takes for it to hit the ground. (when h=0)

hint-initial velocity when dropped is 0

- algebra 2 -
**Reiny**, Sunday, May 26, 2013 at 9:50pm
in non-metric units

h = -16t^2 + 0t + 200 , where t is in seconds and h is in feet

so when it hits the ground , h = 0

so 0 = -16t^2 + 200

16t^2 = 200

t = √(200/16) = 10√2/4

= 5√2/2 or appr 3.54 seconds

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