A blob of material in outer space moves at 3 m/s when it collides and sticks to a half-as-massive blob initially at rest. Compared with the initial kinetic energy of the 3-m/s blob, the kinetic energy of the coupled blobs is
A) one-third.
B) two-thirds.
C) three-quarters.
D) not enough information
Answer: B) two-thirds.
Physics & Space Science
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