A 40-Kg Mass on the End of a String Rotates in in a Circular

Multiple Choice

A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?

A) 39 N
B) 20 N
C) 44 N
D) 0 N
E) 30 N