Ken and Barbie are skating together on a rink at 3.00 m/s.

Ken keeps asking Barbie how much she weights. Annoyed, Barbie pushes away from Ken so that she speeds up to 4.0 m/s and he slows down to 2.25 m/s in the same direction. Assuming that the friction is negligible, if Ken's mass is 70 kg, what is Barbie's mass?

Public Answer

NKT5QQ The First Answerer