# Mechanics M1

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A girl swims across a river. When she swims in still water, she swims at 1.25 m/s, the river flows parallel to its banks at v m/s. The girl aims to swim upstream at angle θ degree to the river bank so that her resultant velocity of 1 m/s is along AB, perpendicular to the river bank.
Find V and θ

• Mechanics M1 -

velocity downstream is zero (she swims directly across)

1.25cosTheta=1 solve for theta

1.25sinTheta=V solve for V

• Mechanics M1 -

is the same thing if in problem say
"at angle θ degrees parallel to the river bank"

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