5. Water is moving with a speed of
5.18 ms–1 through a pipe with a cross-sectional area of 4.20 cm2. The water gradually descends 9.66 m as the pipe increase in area to 7.60 cm2. The speed of flow at the lower level is
(a) 3.0 ms–1 (b) 5.7 ms–1
(c) 3.82 ms–1 (d) 2.86 ms–1
Answer-d
(9)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)