Centripetal acceleration is the acceleration of an object that is moving in a circular motion. It is calculated by dividing the square of the velocity to the radius of the circular path. It is calculated as follows:
a = v^2 / r = 4.0^2 / 0.4 = 40 m/s^2
<span>Amethyst is a crystalline quartz, its colours range from light to dark purple. The purplish colour of amethyst is due to high energy radiations, such as gamma rays, from radioactive sources, the presence of trace elements and the presence of iron found in its crystal lattice. The colour cetre created by Fe4+ is a principal contributor to the colouring of amethyst.</span>
Distance=average velocity x time =((12+8)/2) x 3 =30m
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