Water is filled in a uniform container of the area of cross section A. A hole of cross-section area a (<< A) is made in the container at a height of 20 m above the base. Water streams out and hits a small block placed at some distance from the container. With what speed (in ms−1) the block should be moved such that water streams always hits the block. (Given aA=120). (Take g=10ms–2)
Velocity of efflux v=√
The velocity of the block must be (dxdt).
Using equation of continuity
equation (i) and (ii)