When a stone is spun uniformly in a horizontal plane using a string, choose the correct statement:

Uniform Circular Motion
The stone is moving at a constant speed along a circular path.
Even though the speed is constant, the velocity is continuously changing direction, which means the stone is accelerating.
Centripetal Force
This acceleration is called centripetal acceleration, directed towards the center of the circle.
The force responsible for this acceleration is the tension in the string.
Without this inward force, the stone would move off in a straight line (tangent to the circle) due to inertia.
Key Points
The tension is always directed towards the center of the circular path.
The stone’s velocity is tangential to the circle, but the force is radial (inward).
If the string breaks, the stone will fly off tangentially, not radially.
In short: The tension in the string acts as the centripetal force, keeping the stone in uniform circular motion.