SOLUTION: A sandbag is dropped off a high-altitude balloon at an altitude of 10,000 ft. When will the sandbag hit the ground?

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Question 940050: A sandbag is dropped off a high-altitude
balloon at an altitude of 10,000 ft. When will the sandbag hit the
ground?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

the formula is:
h+=+-16t%5E2%2Bs
where h is the ending height (at the end height is 0) in feet and
t is time in seconds, and s=10000 starting height
0+=+-16t%5E2%2B10000......divide both sides by 16
0+=+-t%5E2%2B625
t%5E2=+625 take square roots of both sides:
sqrt%28+t%5E2%29=sqrt%28625%29+
t=25+
Answer: it will hit the ground in 25 seconds