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Magnitude and direction of boy's velocity after collision on an ice-skating rink

A 30kg girl moving with speed 2m/sec and a 50kg boy moving with speed 1m/sec collide head-on on an ice-skating rink. As a result of the collision, the girl moves at 1m/sec opposite to her initial direction. Find the magnitude and direction of the boy's velocity after the collision.

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We know from momentum equation
m1u1 +m2u2 =m1v1+m2v2
taking m1 ...

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