21. A subway train travels from one station to the next in 2 min. Its distance, in kilometres, from the first station after t minutes is s(t) = t² – t³. At what times will the train have a velocity of 0.5 km/min?
21. A subway train travels from one station to the next in 2 min. Its distance, in kilometres, from the first station after t minutes is s(t) = t² – t³. At what times will the train have a velocity of 0.5 km/min?
Chapter3: Polynomial Functions
Section3.5: Mathematical Modeling And Variation
Problem 7ECP: The kinetic energy E of an object varies jointly with the object’s mass m and the square of the...
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Transcribed Image Text:the rate at wn
object Hits
ground to tHE
21. A subway train travels from one station to the next in 2 min. Its distance, in
kilometres, from the first station after t minutes is s(t) = t² – t. At what
times will the train have a velocity of 0.5 km/min?
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