Question 476328
A ball is thrown downward from a window in a tall building. It's position at time t in seconds is s=16t^2+32t, where s is in feet. How long (to the nearest tenth) will it take the ball to fall 217 feet?
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Solve:
16t^2+32t = 217
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t = [-32 +- sqrt(32^2-4*16*-217)]/(2*32)
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t = [-32 +- 122.11]/64
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Positive solution:
t = 1.41 seconds
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Cheers,
Stan H.