Consider a 5.0 kg object traveling to the right at 25. m/s and colliding with a stationary 1.0 kg object. How much momentum was transferred to the 1.0 kg object?
In your previous posting, you stated how fast the 5 kg object was traveling after the collision. We need that info here to solve this....if it is travelling at 20 m/s , I already answered this in the previous posting