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The figure shows the overhead view of a disk rotating counterclockwise. The angular speed of the disk is decreasing. Which of the vector correctly represents a total acceleration of a point on the rim of the disk :

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$1$

$2$

$3$

$4$

answer is C.

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Detailed Solution

For the decreasing speed of the disk, there are two accelerations $a_{n}$ and $(- a_{t})$ as shown.Component $a_{t}$ is vertically upward and component is radially inward .

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