A 0.5-kg blob of clay moving at 2.0 m/s slams into a 4.0-kg blob of clay at rest. The speed of the two blobs stuck together after colliding is about
A) 1.1 m/s.
B) 1.5 m/s.
C) 2.5 m/s.
D) none of the above
Answer: D
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