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If a body covers a semicircular path of ...

If a body covers a semicircular path of radius r in time t then its average speed and veloity will be---

A

`(pir)/t,2r/t`

B

`(2pir)/t,r/t`

C

`(pir)/(2t),r/(2t)`

D

`(2pir)/t,2r/t`

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