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)

Options

A. `200 pi`
B. `100 pi`
C. `400 pi`
D. None of the above

Answer

A