The position of an object is given as a function of time by : x = 15 + 4t - 2t^3, where x is in kilometres and t is in hours. According to this equation, a) what is the object’s starting point? b) what is the average acceleration during the interval from t = 1.0 h to t = 2.0 h? c) what is the acceleration at t=2.0 h?

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Chapter1: Units, Trigonometry. And Vectors
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 The position of an object is given as a function of time by :
x = 15 + 4t - 2t^3, where x is in kilometres and t is in hours. According to
this equation,
a) what is the object’s starting point?
b) what is the average acceleration during the interval from t = 1.0 h
to t = 2.0 h?
c) what is the acceleration at t=2.0 h? 

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