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1 December, 13:11

If a body moves in a straight line according to the law s = 24t + 3t^2 - t^3, where s is the distance measured in meters from the origin and t is the time in seconds after it starts to move, calculate the body's velocity as a function of time.

A. 63 m/s

B. 15 m/s

C. 27 m/s

D. 81 m/s

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  1. 1 December, 13:39
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    As the comments state, the velocity is the derivative of the position.

    Therefore, the velocity as function of time is:

    ds / dt = 24 + 6t - 3t^2.

    That is a parabola whose maximum is (1,27). With that you know that the velocity will never be either 63 m/s or 81 m/s.

    Also, you know that the velocity at t = 1 s is 27 m/s.

    And, you can also find that the velocity at t = 3 is 15 m/s.

    I am confident on that this analysis solves your question. Else, insert a comment.
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