Consider the situation shown in the figure. The surface is smooth and the string and the pulley are light. Find the acceleration of each block and tension in the string.

Explanation

Let a 3 kg block be moving downward.

Along the plane :

`30 sin 30^(@)-T=3a`….. (i)
`T-20=2a`…(ii)
`a=-1 ms^(-1)`
T=18 N
since, the acceleration is negative, i.e., the block of mass 3 kg is moving upward.