Question : A fan is making 600 revolutions per 𝑚𝑖𝑛𝑢𝑡𝑒. If after some time it makes 1200 revolutions per 𝑚𝑖𝑛𝑢𝑡𝑒, then increase in its angular velocity is a
(A) 10 𝜋 𝑟𝑎𝑑/𝑠𝑒𝑐
(B) 20 𝜋 𝑟𝑎𝑑/𝑠𝑒𝑐
(C) 40 𝜋 𝑟𝑎𝑑/𝑠𝑒𝑐
(D) 60 𝜋 𝑟𝑎𝑑/𝑠𝑒c
Answer : option (B)
Solution :
