A block of metal weighing \( 2 \mathrm{~kg} \) is resting on a frictionless plane (as shown in f...

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A block of metal weighing \( 2 \mathrm{~kg} \) is resting on a frictionless plane (as shown in figure). It is struck by a jet releasing water at a rate of \( 1 \mathrm{kgs}^{-1} \) and at a speed of \( 10 \mathrm{~ms}^{-1} \). Then, the initial acceleration of the block, in \( \mathrm{ms}^{-2} \), will be
(a) 3
(b) 6
(c) 5
(d) 4
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