Aperson is rowing across the river with a velocity of 4.5 km/hr northward. the river is flowing eastward at 3.5 km/hr (figure 4). what is the magnitude of her velocity ( v ) with respect to the shore?

The magnitude of her velocity ( v ) with respect to the shore is 5.70 km/h.

Explanation:

Magnitude of  Velocity of the boat = Q

Magnitude of Velocity of the river flowing = P

R = Resultant velocity due to velocity of boat and velocity of river.

Applying Law of triangles of  vector addition :

From the figure attached:

P = 3.5 k/h, Q = 4.5 km/h

The magnitude of her velocity ( v ) with respect to the shore is 5.70 km/h.

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