The angular momentum of rotating body is increased by 20%. What will be the increase in its rotational kinetic energy ?

Explanation

Kinetic energy K.E. `=(L^(2))/(2I)" "EalphaL^(2)`
`(E+DeltaE)/(E)=((120)/(100))^(2)` (or) `(DeltaE)/(E)=0.44`
`(DeltaE)/(E)xx100=44%`