Solving a Motion Problem in 2 Dimensions

[rishiraj20006]

Frendz , here is a problem of motion in 2 dimensions. I simply stuck in basics .

A man wants to cross a river 100mt long He has a velocity of 10m/s in still water and river has a velocity of 20m/s. What angle should he make with flow of river so that displacement from where he started initially should be minimum?

I guess some concept of maximum and minimum will be used here but I don’t know how to apply

 

[TheloniousMONK]

Think of this in terms of vectors. I think the question is asking for the man's down-river vecocity to be 0 and his velocity across the river to be a maximum. Let us know if you need further assistance.

 

[QuantumCrash]

No need to shout. This is not a projectile question but instead a vector question. Resolve the rivers vectors horizontally and vertically first.