Question 187536
a sandbag falls out of a hot air balloon that is 144ft above the ground. How long does it take for the sandbag to reach the ground? 
to find the answer, use the equation 0=-16t^2+144 in which the time(t), in seconds, is the time it takes to hit the ground. 
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use the equation 0=-16t^2+144
16t^2 = 144
t^2 = 9
t = 3 seconds  (ignore the t = -3)