a small mass m attatched to the end of a string reveloves in a circle on a frictionless tabletop. the other end of the string passes through a hole in the table. Initially the mass revolves with a speed v1=2.4 m/s in a circle of radius r1=0.80m. the string is then pulled sloly through the hole so that the radius is reduced to r2=0.48m. what is the speed v2 of the mass now

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.