An exoplanet has twice the mass and half the radius of theEarth. Find the acceleration due to gravity on its surface, interms of g, the acceleration of gravity at Earth’s surface. (a) g(b) 0.5g (c) 2g (d) 4g (e) 8g.

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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.