Question

(a) The current in a river flows at 1.35 ms-1 relative to an observer on the shore. A swimmer with a velocity of 3.12 ms-1 relative to the water swims directly upstream. What is the velocity of the swimmer relative to an observer on the shore?

i used v=v water + v swimmer
-1.35 + 3.12 = 1.77 is this correct ?

Answer 1

Vs = 3.12 - 1.35 = 1.77 m/s.