Beginning from rest when = 20, a 35-kg child slides with negligible friction down the sliding

Beginning from rest when θ = 20°, a 35-kg child slides with negligible friction down the sliding board which is in the shape of a 2.5-m circular arc. Determine the tangential acceleration and speed of the child, and the normal force exerted on her (a) when θ = 30° and (b) when θ = 90°.

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R = 2.5 m