The position co-ordinates of a particle moving in a $3-D$ coordinates system is given by $x = a\,cos\,\omega t$ , $y = a\,sin\,\omega t$ and $z = a\omega t$ The speed of the  particle is
  • A$\sqrt 2 \,a\omega$
  • B$a\omega $
  • C$\sqrt 3 \,a\omega$
  • D$2\,a\omega $
JEE MAIN 2019, Medium
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