A 73 g ball is fastened to one end of a string
23 cm long and the other end is held fixed at
point O so that the string makes an angle of
20◦ with the vertical,
This angle remains constant as the ball rotates in
a horizontal circle. The angle would remain
constant only for a particular speed of the ball
in its circular path.
The acceleration of gravity is 9.8 m/s2 .
Find this speed v.
Answer in units of m/s
