Two blocks of mass `m_1` and `m_2` are connected by a massless spring and placed at smooth surface . The spring initially stretched and released . Then
Since , no external force is present on the system . So conservation principle of momentum is applicable .
`:.` `vec(p_i) = vec(p_f) = vec (p_1) + vec(p_2)`
`:.` ` vec (p_1) = - vec (p_2)` ( `because vec (p_i) = 0)`
`:.` l`vec(p_1)`l = l - `vec(p_2)`l
`:.` `vec(p_1) = vec(p_2)`
From this point of view, it is clear that moments of both particles are equal in magnitude but opposite in direction .
Also friction is absent . So total mechanical energy of system remains conserved .
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