Aboat moves north at a speed of 2.7 m/s across a river that flows west at a rate of 1.2 m/s what is the boat's speed relative to the riverbank?

The boat speed relative to the riverbank is 2.96 m/s

Explanation:

The boat move to the north at 2.7 m/s across the river and the river current is 1.2 m/s to the west, therefore the direction of the boat is perpendicular to the river (90).

The boat speed vb = 2.7 m/s

The current speed vc = 1.2 m/s

The formula to calculate the speed of the boad relative to the riverbanks (Vbc), as follow

vbc =

      =

since cos 90 = 0, hence

vbc =

      = 2.96 m/s

wavelength variability is the right one

490 n

f=125n a=2.5m/s2