Let ar and at represent radial and tangential accelerations. The motion of a particle may be circular, if
A
ar=0,at=0
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B
ar=0,at≠0
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C
ar≠0,at=0
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D
None of these
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Solution
The correct option is Car≠0,at=0 Even when there is no tangential acceleration, the centripetal acceleration has to be present to change the direction of velocity at all instants of time and the centripetal acceleration is the net acceleration in such a case. This is the case of uniform circular motion.