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## Homework Statement

a spool of radius R1 and R2 (R2>R1) is kept on hortizontal surface. A force f= 2t N (where t is time ) acts on the inner radius tagentially find the angular momentum of the system about the bottomost point of the spool.

## Homework Equations

v=u+at

W=Wi+alpha(t)

L=IW+mvr

## The Attempt at a Solution

but the answer is t^2(R1+R2)