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20200140040

Post by ada » Thu Feb 01, 2018 5:19 pm

The speed of a ball thrown down from a building is given as $s=3+9t$, where $s$ is the speed at which the ball is travelling in $m/s$ and $t$ is the time in seconds after the ball is thrown. At what times is the speed between $21m/s$ and $39m/s$?
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