A point on the rim of a 0.75 m diameter grinding wheel changes speed at a constant rate from 15 m/s to 21 m/s in 6.2 s. What is the average angular acceleration of the wheel in rad/s^2?

Answer 1

Divide the angular velocity change by the time interval required for that change.

The angular velocity change is
delta w = (21 - 15)/R = 8.0 rad/s

Divide that by 6.2 s

Answer 2

please give me answer