QUESTION
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?
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