A 4 kg is on the end of a 1.6-m rope. It is held at point A, with the rope horizontal, and is given an initial downward velocity. It moves through three quarters of a circle with no friction and arrives at B, with the rope barely under tension. Its initial velocity at point A, is closest to?

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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.