SOLUTION: 89. Penny tossing. If a penny is thrown downward at 30 ft/sec from the bridge at Royal Gorge, Colorado, how long does it take to reach the Arkansas River 1000 ft below?

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Question 383968: 89. Penny tossing. If a penny is thrown downward at 30 ft/sec
from the bridge at Royal Gorge, Colorado, how long does it
take to reach the Arkansas River 1000 ft below?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
neglecting air resistance ___ h = 16t^2 + 30t ___ 1000 = 16t^2 + 30t

16t^2 + 30t - 1000 = 0 ___ 8t^2 + 15t - 500 = 0

use the quadratic formula to find t ___ the positive solution is the one you want