Question

One end of massless intextensible string of length l is fixed and other end is to tied to a small ball off mass m. The ball is performing a circular motion in vertical plane. at the lowest position, speed of ball is$\sqrt{20gl}$ . Neglect any other forces on the ball except tension and gravitational force. Acceleration due to gravity is g.

• A. At the highest position of ball, tangential acceleration of ball is 0
• B. At the highest position of ball, tangential acceleration of ball is g
• C. during circular motion, minimum value of tension in the string is 15 mg
• D. During circular motion, maximum value of tension in the string is 21 mg

Answer 1

Answer: (A), (C), (D)

The correct options are
A At the highest position of ball, tangential acceleration of ball is 0
C during circular motion, minimum value of tension in the string is 15 mg
D During circular motion, maximum value of tension in the string is 21 mg