A 30-Kg Mass Is Released from Rest at Point a of of a Circular

Multiple Choice

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