Ariver flows at a speed of 4.60m/s. a boat, capable of moving with a speed of 5.80m/s in still water is rowed across the river at an angle of 53.0° to the river flows. calculate the resultant velocity with which the boat moves and the angle that it's resultant motion makes to the river flow

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray