A horizontal jet of water with its cross-sectional area

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A horizontal jet of water with its cross-sectional area of 0.0028 m² hits a fixed vertical plate with a velocity of 5 m/s. After impact the jet splits symmetrically in a plane parallel to the plane of the plate. The force of impact (in N) of the jet on the plate is

1. 90
2. 80
3. 70
4. 60

Correct Option: C

Force on plate = (r_a av)v
= ra .aV²
= 1000 × 0.0028 × 5²
= 70 N