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)

Water is filled in a uniform container of the area of cross section A.

1.	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)
Answer» 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 $m s^{- 1}$ ) the block should be moved such that water streams always hits the block. (Given $\frac{a}{A} = \frac{1}{20}$ ). (Take $g = 10 m s^{- 2}$ )