Asked by Melissa

Your English teacher can swim with a constant speed of 0.67m/s. While facing south , he attempts to swim straight across the St. Lawrence River , which moves east at 1.4 m/s
a) find his velocity as seen from the riverbank.

B) if the river was 175m wide
How long does it take him to cross the
River



Hri

Answers

Answered by Elena
teacher: v1=0.67 m/s,
river: v2 =1.4 m/s,
v=sqrt(v1²+v2²) =1.55 m/s. (to the east of south)
L =175 m,
s=?
v/v1=s/L =>
s= v•L/v1 =1.55•175/0.67 =404 m.
t=s/v =404/1.55 =260 s =4.34 min
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