Physics, asked by manya112, 1 year ago

A river 4.0 miles wide is following at the rate of 2 miles/h .The minimum time taken by a boat to cross the river with a speed 4 miles / h (in still water ) is approximately ____________

Answers

Answered by subhraghosh
32
width of the river d=4 miles
speed of water v=2 miles/h
minimum time only taken to cross the river when the speed of boat is parallel to the resultant speed of v and u(when u= speed of boat= 4miles/h)
now , the resultant speed w=√(v)2+(u)2
d=w t
minimum time t=4/2√5=2√5 h
Answered by shaikhanis
18

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