Mr. M is taking a turn with radius r at a speed v. If he maintains the same speed but takes the turn with 1/2r, how does the second centripetal acceleration compare to the first? (a) 4 times smaller (b) 2 times smaller (c) 4 times bigger (d) 2 times bigger

Q: What is the speed of a car moving around a circle of radius 20m if its acceleration is 5m/s^2?

A: Radius of the circle is R = 20 m Centripetal acceleration of the car is ac = 5 m/s2

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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.