A `2 kg` block moving with `10m//s` strikes a spring of constant `pi^(2)N//m` attached to

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A `2 kg` block moving with `10m//s` strikes a spring of constant `pi^(2)N//m` attached to `2Kg` block at rest kept on a smooth floor. The time for which rear moving block remain in contact with spring will be-
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Sir I don't get it,
It remains in contact with the spring for the whole oscillation right? So I guess the time period is 2s...

varalakshmibonu