A 3.0-kg mass is released from rest at point A of a circular frictionless track of radius 0.40 m as shown in the figure. The mass slides down the track and collides with a 1.4-kg mass that is initially at rest on a horizontal frictionless surface. If the masses stick together, what is their speed after the collision?
A. 2.1 m/s
B. 1.7 m/s
C. 1.9 m/s
D. 1.5 m/s
E. 2.3 m/s
Answer: C
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