A 0.2-kg stone attached to a string is swung in a circle with a radius 0.6 m on a horizontal frictionless surface. What is the tension in the string if the stone makes 150 revolutions per minute?

The value is  

Explanation:

From the question we are told that

      The mass of the stone is  

      The radius of the circle is

      The angular speed is  

Generally the tension in the string is mathematically represented as

=>        

=>        

i believe the answer is a

c. magnitude and direction