Answer :
The correct answer is a. 10 km/h.
b. The boat would move at 10 km/h at a 37-degree upstream angle to cross straight (into the current)
To be more precise, the rate of change in an object's position relative to a frame of reference and time is another way to describe velocity. It determines how quickly or slowly something is going. Consider a scenario in which there are two moving items. If both items are going in the same direction, it is simple to determine which one is moving faster than the other.
v = √v_x^2 +v_y^2
v = √((8 km/h)^2 + (6 km/h)^2)
=10 km/h
direction = θ = tan^-1 (opposite / adacrent)
= tan^-1 (6/8)
= tan^-1 (37)
= 37 degree down stream.
To learn more about velocities refer the link:
https://brainly.com/question/28390853
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