A disc of mass 10 gm is kept horizontall...

A disc of mass 10 gm is kept horizontally in air by firing bullets of mass 5 g each at the rate of `10//s.` If the bullets rebound with same speed. The velocity with which the bullets are fired is -

`49cm//s`

`98cm//s`

`147cm//s`

`17.97cm//s`

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