The law of motion of a body moving along a straight line is $x = \frac{1}{2} vt$,where $x$ is its distance from a fixed point on the line at time $t$ and $v$ is its velocity. Then:

  • A
    acceleration $f$ varies directly with $x$
  • B
    acceleration $f$ varies inversely with $x$
  • C
    acceleration $f$ is constant
  • D
    acceleration $f$ varies directly with $t$

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