Question

a parson rows a boat in a water with the speed of 4ms-1 . water in the river is following with the speed of 2ms-1. if the person rows the baot perpendicular to the direction of flow. find the resultant velocity of baot and time taken by baot to cross the river if width of river is 400m​

Answer 1

Answer:

resultant velocity will be 2√5ms-1.

Time taken to cover 400 m is 100s.

Explanation:

Resultant velocity can be taken out be vector addition=√(4×4)+(2×2)

=2√5ms-1.

The person can cross the river with it's own rowing velocity and not by river's velocity.

So,Time taken will be=400÷4= 100s.