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The equation of a particle executing simple harmonic motion is given by x = sin π ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + 3 1 t m. At t = 1s, the speed of particle will be-

1. 0 cm s –1
2. 157 cm s –1
3. 272 cm s –1
4. 314 cm s –1

Correct answer: 157 cm s –1

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