@Tech-With-Us instead of potential energy we take consideration the work done by gravity
@aarushi-kalia (no. Of elements in set of first term) X ( no. of elements in set of common difference) = Ans i.e. 15
@Siddhartha-Ghosh use relative velocity and acceleration in one body's frame of reference
Maybe there's a printing mistake
What's a bisector circle??
@Kartik-Kumar the question is for small oscillations. Since the theta is too small I have taken its arc length to be equal to ((a)theta) and ((b)theta) which is equal to the extension in spring