A safety device brings the blade of a power mower from an initial angular speed of ?1 to rest in 1.00 revolution. At the same constant acceleration, how many revolutions would it take the blade to come to rest from an initial angular speed ?3 that was three times as great, ?3 = 3?1?

Solution 17E Step 1 of 2: Let be the initial angular speed and be the final angular speed to under a o displacement of with constant acceleration . Using the equation from the relation of kinematics, = 2 0 As the blade come to rest at the end, =0 and the angle will be the stopping angle, That is, 0 = 2