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pttest
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Homework Statement
After fixing a flat tire on a bicycle you give the wheel a spin. Its initial angular speed was 7.05 rad/s and it rotated 13.7 revolutions before coming to rest. What was its average angular acceleration?
Homework Equations
ω2 = 2 alpha . theta
The Attempt at a Solution
ωi = 7.5 rad/s
ωf = 0
theta = 13.7 rev = 86.04 rad
alpha = ?
Using the above equation : alpha = -0.327rad/s^2. But the answer is wrong. Could someone help me??
Thanks in advance