A classical mechanics problem by Kushal Patankar

A small ball of mass mm is attached to the end of the string of length l=1 ml=1 \ m whose other end is fixed. From its lowest position, the ball is given kinetic energy mgl5\frac{mgl}{5}. Calculate the net acceleration (inm/s2)(in m/s^2) of the ball at the instant when the string makes an angle θ=37° \theta=37° with the vertical.

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