1.

Find the acceleration of center of mass of the blocks of masses m_(1) and m_(2) (m_(1)gtm_(2)) in Atwood.s machine:

Answer»

SOLUTION :We know from Newton.s laws of motion magnitude of acceleration of each block is
`a=((m_(1)-m_(2))/(m_(1)+m_(2)))G`

Now acceleration of their C.M is
`a_(cm)=(m_(1)a+m_(2)(-a))/(m_(1)+m_(2)),a_(cm)=((m_(1)-m_(2))/(m_(1)+m_(2)))a`
`a_(cm)=((m_(1)-m_(2))/(m_(1)+m_(2)))((m_(1)-m_(2))/(m_(1)+m_(2)))g`
`:.` ACCLERATION of centre of mass `a_(cm)=((m_(1)-m_(2))/(m_(1)+m_(2)))^(2)g`


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