A 5.0-kg ball and a 10.0-kg ball approach each other with equal speeds of 20 m/s. If they collide perfectly inelastically, the speed of the balls just after the collision is approximately
A) 1.0 m/s.
B) 20 m/s.
C) 6.7 m/s.
D) 1.5 m/s.
E) zero.
Correct Answer:
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