At the center of a 40.1 m diameter circular (frictionless) ice rink, a 72.8 kg skater travelling north at 1.14 m/s collides with and holds onto a 61.2 kg skater who had been heading west at 4.74 m/s. How long will it take them to glide to the edge of the rink? Ans: 8.90 s b)  Where will they reach it? Give your answer as an angle north of west. (Attached below is what I attempted for b), but apparently it is wrong)

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”