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Unformatted text preview: student population, and students know the rumor, then
not know the rumor. Therefore the DE is
( 6 pts 5. The DE is
. When
From this we conclude
Integrating the DE, we have students do ) , we are told that the rate of change of speed is
. Simplifying gives
()
⁄
Solving for when
gives
sec.
Note that
only as
. Therefore under this simple model the train never stops.
6 pts 6. For a vertical motion under gravity we know the DE is Integrating gives
() . We are given that
hit the ground when . The appropriate value fo...
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 Fall '08
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