A point traversed half a circle of radiu...

A point traversed half a circle of radius r during a time interval `t_(0)`, its mean speed and magnitude of mean velocity are

`(pir)/t_(0),r/t_(0)`

`(2pir)/t_(0),(2r)/t_(0)`

`(pir)/t_(0),(2r)/t_(0)`

`(2pir)/t_(0),r/t_(0)`

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