Answer:
a)t= 3 s
b)θ = 18.9 rad
Explanation:
Given that
Initial angular velocity ,ωi = 12.6 rad/s
Acceleration ,α = - 4.2 rad/s²
Final angular speed ,ωf = 0 rad/s
We know that
ωf =ωi + α t
t=Time
Now by putting the values
0 = 12.6 - 4.2 x t
[tex]t=\dfrac{12.6}{4.2}\ s[/tex]
t= 3 s
We also know that
ωf² =ωi² + 2 α θ
θ=Angle
Now by putting the values
0² =12.6² - 2 x 4.2 x θ
[tex]\theta=\dfrac{12.6^2}{2\times 4.2}\ rad[/tex]
θ = 18.9 rad
a)t= 3 s
b)θ = 18.9 rad
