Solution: From the laws of motion in the case of rotational motion, We know that ω = ω 0 + αt. From the given data : ω 0 = 900rpm = 900 x 2π/60 rad/s. ω = 0 and t= 60s. Hence angular deceleration α = π/2. Question 3: A bus is moving in a circular track of radius 1000cm with a speed of 10m/s.

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