Question: For a marble rolling at a constant speed through the interior of a hemispherical bowl (half of a sphere), the direction of the total acceleration

For a marble rolling at a constant speed through the interior of a hemispherical bowl (half of a sphere), the direction of the total acceleration is

In the direction of the vector sum of the gravitational acceleration and the radial acceleration. Towards the centre of the circle. In the direction of the vector difference of the gravitational acceleration and the radial acceleration. Straight down.

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