A block of mass m is attached to a cart ...

A block of mass m is attached to a cart of mass 4m through spring of spring constant k as shown in the figure. Friction is absent everywhere. The time period of oscillations of the system, when spring is compressed and then released, is

`pi sqrt((m)/(k))`

`2pi sqrt((m)/(k))`

`2pi sqrt((5m)/(2k))`

`4pi sqrt((m)/(5k))`

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