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6 September, 20:43

A particle moves along the x axis according to the equation x = 6t², where x is in meters and t is in seconds. Therefore:

A. the acceleration of the particle is 6 m/s²

B. t cannot be negative

C. the particle follows a parabolic path

D. each second the velocity of the particle changes by 9.8 m/s

E. none of the above

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Answers (1)
  1. 6 September, 22:28
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    Answer is E

    time can be negative.

    A is not true because a = d2 x d t2 = 12 m / s2

    C: question already said that particle move along x-axis, which is not parabola path.

    D: velocity is dx dt = 12t, therefore velocity changes by 12 m/s and not 9.8 m/s

    So we are left with E.
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