An object of mass m has angular acceleration `alpha =0.2" rad s"^(-2)`. What is the angular displacement covered by the object after 3 second ? (Assume that the object started with angle zero with angular velocity).

Answer

Given: Angular acceleration `alpha=0.2" rads"^(-2)`
Time =3s
Initial velocity =0

Explanation

`theta=omega_(0)t+(1)/(2)alphat^(2)`
`theta=(1)/(2)xx0.2xx3^(2)=0.9` rad (or) `51^(@)54`