• An unknown mass is attached to a light inextensible string which has a length of $3\mathrm{.}2$m$.$? The other end of the string is attached to a fixed point. The mass is made to move in a horizontal circle as shown in the diagram. When the angle between the string and the vertical axis through the fixed point is $30º,$ 
• ?calculate:
• a$)$ ?the instantaneous speed of the mass .
• b$)$ ?the frequency of the mass in revolutions per minute. 

Fixed Point 3.2 m/30 R