Question

Q.1
A man is trying to cross the river 100m wide by a boat. The river is flowing with the velocity 5m's and the
boats velocity in still water is 3m/s. Find the minimum time in which he can cross the river and the drift in this case?​

Answer 1

Answer:

let river velocity is

v

r

=5

i

^

A man is trying to cross a river least possible displacements by swimming at an angle of 143 to the stream

Let the velocity of the man is v

m

shown in the diagram v

m

sin53

0

=5

⇒v

m

=

4

25

The drift he suffers when he is crossing the same river in the least possible time is D when he cross the river perpendicular to the direction of the river flow , time taken by the man is t

⇒t=

v

S

=

25

1000

×4=160sec.

drift is D=v

r

t=5×160=800m

solution

hope it helps

thank you

Answer 2

Answer:

Explanation:

minimum time = 100/3 sec

drift = 100/3 * 5

drift = 500/3 m