Question 1199441
When a ball is thrown upward, its height, h meters, is given by h=1.5+19.6t-4.9t2, where t seconds is the time after it is thrown. For what length of time is the ball higher than 16.2m?
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The 2 seconds answer from Ikleyn is the time it's at or above 16.2 meters, not above.
So it's 2 - dt seconds.
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dt = Planck time {{{10^-43}}} seconds
Maybe 2 Planck times.