On a smooth incline

PHYSICS · Single correct · CBSE · Physics · Motion in a Plane · Motion in a Plane

Problem

On a smooth incline, a block is observed to accelerate down the slope at 4.0 m s−24.0\,\text{m}\,\text{s}^{-2}. Take g=9.8 m s−2g = 9.8\,\text{m}\,\text{s}^{-2}. The angle θ\theta that the plane makes with the horizontal is approximately (a) 42∘42^{\circ} (b) 22∘22^{\circ} (c) 24∘24^{\circ} (d) 66∘66^{\circ}

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