Water flowing through a nozzle of cross ...

Water flowing through a nozzle of cross section area `1 cm^2` strikes a 2kg block at 1kg/s rate as shown. If water flow comes to rest immediately after striking the block then initial acceleration of block is

A

`3 m/s^2`

B

`5 m/s^2`

C

`4 m/s^2`

D

`2 m/s^2`

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