A rowboat heads directly across a river at a speed of 3 m/s. Select the correct equations that show that if the river flows at 4
m/s, the speed of the boat relative to the riverbank is 5 m/s.
1 answer:
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B
Assume north and east as two sides of a right angled triangle. magnitude of the distance is then given by the length of the hypotenuse which is
where a = 1.2 km north
and b = 1.6 km east
magnitude = 2 km
Direction is given by the angle between them, that is atan(a/b) = 36.86 deg north of east = 53.1 deg east of north.