A 2 kg object is attached to a string and swung in a horizontal circle of radius 1.5 m with a constant speed of 4 m/s. What is the tension in the string?

Core Concept

The tension in the string provides the centripetal force required for circular motion. Using F = mv²/r: F = (2 kg)(4 m/s)²/(1.5 m) = (2 kg)(16 m²/s²)/(1.5 m) = 32/1.5 N = 21.3 N.