Man walking forward in canoe at 0.50 m/s relative to shore

[raek]

Homework Statement

A 75-kg man sits in the back of a 120-kg canoe that is at rest in a still pond. If the man beings to move forward in the canoe at .50m|s relative to the shore, what happens to the canoe?

Homework Equations

The equation they gave me is m1v1+m2v2 = m1v1'+m2v2'
I don't get it.

The Attempt at a Solution

I didn't really make an attempt. All I have on the paper is
(120 kg)(.50m|s) + ... I don't know what to put there. If it's even right!

 

[stellaman]

You have 2 different parts. At rest and moving, aka before and after, aka primed and unprimed.