An ice hockey puck slides along the ice at 12 m/s. A hockey stick delivers an impulse of 4.0 kg*m/s causing the puck to move off in the opposite direction with the same speed. What is the mass of the puck?

Question

I tried all sorts of ways to set this up and I just cant seem to get it, help?

Answer 1

The momentum change = 2*M*12 m/s = 24 M m/s
where m is the puck mass in kg
That equals the impulse, 4.0 kg m/s
M = 4.0/24 kg = 1/6 kg