Question

A wheel making 20 revolution per second is stopped in 20 seconds. Its angular retardation is
$(1) \: \: \pi \: rad \: s ^{-2}$
$(2) \: \: 2\pi \: rad \: s^{ - 2}$
$(3) \: \: 4\pi \: rad \: s^{ - 2}$
$(4) \: \: 8\pi \:rad \: s^{ - 2}$
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Answer 1

here is your answer mate :-

it's (b)

hope it helps

Answer 2

Answer:

The answer is point (b) ....

hope it may help you....