\[(a)\;35\;N \quad (b)\;2.5\;N \quad (c)\;3.5\;N \quad (d)\;0.25\;N\]

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mass of water pumped per second $ \large\frac{75}{60}$

$\qquad=1.25 kg/s$

$a v=75\; lit/mt$

$\qquad= \large\frac{75 \times 10^{-3}}{60} $$kg/s$

$v=\large\frac{75 \times 10 ^{-3}}{60 \times 6.25 \times 10^{-3}}$

$\qquad=0.2 m/s$

Force of reaction

$F=ma=\large\frac{mv}{t}$

$\quad=\frac{1.25 \times 0.2}{1}=0.25N$

Hence d is the correct answer.

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