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A car travels forward with constant velocity. It goes over a small stone, which gets stuck in the groove of a tire. The initial acceleration of the stone, as it leaves the surface of the road, is 

(A) vertically upward 

(B) horizontally forward 

(C) horizontally backward 

(D) zero 

(E) upward and forward, at approximately 45° to the horizontal

1 Answer

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Correct option (A) vertically upward

Once the stone is stuck, it is moving in circular motion. At the bottom of the circle, the acceleration points toward the center of the circle at that point.

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