The vertical acceleration of a projectile O a. equals g pointing sometims upwards and other times downwards. b.equals g pointing upwards. c. continuously increases. d.equals g pointing downwards. e. is zero.

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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.