The wheel of a toy car rotates about a f...

The wheel of a toy car rotates about a fixed axes. It slows down from 400 rps to 200 rps in 2 s. Then, its angular retardation in `"rad s"^(-2)` is (rps = revolutions per second)

`200 pi`

`100 pi`

`400 pi`

None of these

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