Final answer:
When the string breaks, the ball will continue to move in a straight line tangent to the circle at the point where the string broke.
Step-by-step explanation:
When the string breaks, the ball will continue to move in a straight line tangent to the circle at the point where the string broke. This is due to the concept of inertia, which states that an object will continue to move in a straight line at a constant speed unless acted upon by an external force.
In this case, the ball was initially moving in a circle due to the tension in the string providing the centripetal force to keep it on a circular path. But when the string breaks, the tension force is no longer there, so the ball will no longer move in a circle and instead continue in a straight line tangent to the circle.