A block of metal weighs 2 kg is resting ...

A block of metal weighs 2 kg is resting on a frictionless plane. It is struck by a jet releasing water 1 kg/s and at a speed of 5 m/s. The initial acceleration of the block will be ?

`2.5 m / s^2`

`5 m / s^2`

`10 m / s^2`

`20 m / s^2`

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