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Ques. A float is to overcome by a motor boat going downstream at a point A. T hours later it turns back and after some time it passes the float at a distance d km from point A. What is the velocity of stream if the speed of motor remains constant w.r.t. water ? (As float has no speed of its own hence it will move for the complete time with the flow speed )

Ques. A float is to overcome by a motor boat going downstream at a point A. T hours later it turns back and after some time it passes the float at a distance d km from point A. What is the velocity of stream if the speed of motor remains constant w.r.t. water ?
(As float has no speed of its own hence it will move for the complete time with the flow speed )

Grade:12

1 Answers

Shobhit Varshney IIT Roorkee
askIITians Faculty 33 Points
9 years ago
Dear student,

Please see the following figure:

d+d’ = T (Vb+Vr)
(T+t) Vr = d
d’ = t (Vb – Vr)
256-491_pic.jpg
Calculate Vr using these equations.

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