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Calculus - another question

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"Margaret has found that by a proper choice of gears she can steadily increase her speed on her bike. One day she sets out and, ten minutes later, she achieves her cruising speed of 30km/h by increasing her speed steadily. How far did she travel in that ten minutes?"

I don't know how to begin this!

  • Calculus - another question -

    a = acceleration
    v = Vi + a t
    d = Xi + Vi t + (1/2) a t^2

    30 = 0 + a t = 0 + a (10/60)
    a = 30*60/10 = 180 km/hr^2

    d = 0 + 0 + (1/2)(180)(10/60)^2
    = 90/36
    = 2.5 km

  • Calculus - another question -

    By the way the average speed was 30/2 = 15 for 1/6 of an hour
    15/6= 2.5

  • Calculus - another question -

    Thank you! So the constants (Vi and Xi) are 0...why is that?

  • Calculus - another question -

    Xi is where you started, might as well be at the origin.
    Vi is your speed at the start. Implied zero.

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