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The crank of a slider-crank mechanism rotates counter-clockwise (CCW) with a constant angular velocity $\omega$, as shown. Assume the length of the crank to be $r$.

Using exact analysis, the acceleration of the slider in the $y$-direction, at the instant shown, where the crank is parallel to $x$-axis, is given by

- $- \omega ^2r$
- $2 \omega ^2r$
- $\omega ^2r$
- $-2 \omega ^2r$

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