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When a body moves in circular motion, two types of acceleration act on it.
Tangential acceleration
Radical acceleration

Their combined effect helps the body to move along a circular path about  a fixed central point.
It acts along the body and directed long the center.
θ – angle made by the string with the vertical
T – tension along the string
g – acceleration due to gravity
So radical acceleration: w ^ 2 L
Net radical force = T – mg cosθ