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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)

A

`200pi`

B

`100pi`

C

`400pi`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
`alpha=(Deltaomega)/(Deltat)"but "omega=2pif`
`therefore"Angular acceleration",alpha=(2piDeltaf)/(Deltat)=(2pixx200)/(2)`
`=(200pi)rads^(-2)`
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