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shows three blocks \( A, B \) and \( C \) connected by a cable and system of pulleys. The block \( B \) is pulled downward with a constant velocity of \( 7.5 \mathrm{~cm} / \mathrm{s} \). At \( t=0 \), block \( A \) starts moving downward from rest with a constant acceleration. It is given that the velocity of block \( A \) after travelling \( 20 \mathrm{~cm} \) is \( 30 \mathrm{~cm} / \mathrm{s} \), find the change in position, velocity and the acceleration of block \( C \) at this instant.
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