A boy starts from point A and passes point C of a track ABC shown in the figure. Portion AB of length l is straight and portion BC is a semicircle of radius r (r< I). Anywhere on the track, the modulus of the maximum acceleration of the boy is a. Find minimum transit time of the boy from A to C. &-リ +2/21+Y 2a

A boy starts from point A and passes point C of a track ABC shown in the figure. Portion AB of length l is straight and portion BC is a semicircle of radius r (r< I). Anywhere on the track, the modulus of the maximum acceleration of the boy is a. Find minimum transit time of the boy from A to C. &-リ +2/21+Y 2a

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