A spring gun uses a spring of force constant 100 N/m. A ball of mass 100 g put in barrel and the spring is compressed 0.05 m at a height of 2 m from ground and is held horizontal. Where should the box be placed on the ground so that ball falls in it?

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A spring gun uses a spring of force constant 100 N/m. A ball of mass 100 g put in barrel and the spring is compressed 0.05 m at a height of 2 m from ground and is held horizontal. Where should the box be placed on the ground so that ball falls in it?