Two simple harmonic motions are represented by equations ${y_1} = 4\,\sin \,\left( {10t + \phi } \right)$ and ${y_2} = 5\,\cos \,10\,t$ What is the phase difference between their velocities?
  • A$\phi $
  • B$-\phi $
  • C$\left( {\phi  + \frac{\pi }{2}} \right)$
  • D$\left( {\phi  - \frac{\pi }{2}} \right)$
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