The displacement of an object attached to a spring and executing simple harmonic motion is given by $ x= 2 \times 10^{-9}$ $ cos$ $\;\pi t\left( m \right)$ .The time at which the maximum speed first occurs is
  • A$0.25$
  • B$0.5$
  • C$0.75$
  • D$0.125$
AIEEE 2007, Medium
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