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Two skaters of mass 70kg and 60kg are skating towards each other. The 70kg skater is...

Two skaters of mass 70kg and 60kg are skating towards each other. The 70kg skater is moving east at a velocity of 10m/s, and the 60kg skater is moving 30° west of north at velocity of 13m/s. When they meet, they hold hands and skate together at velocity v. Calculate the magnitude of v.

(A) 9.9m/s

(B) 3.m/s

(C) 11.m/s

(D) 5.7m/s

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