A particle of mass $10\, gm$ moves in a field where potential energy per unit mas is given by expression $v = 8 \times 10^4\, x^2\, erg/gm$. If the total energy of the particle is $8 \times 10^7\, erg$ then the relation between $x$ and time $t$ is
  • A$x = 10\,\sin \,\left( {400\,t + \phi } \right)\,cm$
  • B$x = \,\sin \,\left( {400\,t + \phi } \right)\,m$
  • C$x = 10\,\sin \,\left( {40\,t + \phi } \right)\,cm$
  • D$x = 100\,\sin \,\left( {4\,t + \phi } \right)\,m\,\left[ {\phi  = {\rm{constant}}} \right]$
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