The speed of a 4-kg ball with a momentum of 12 kg m/s is
A) 3 m/s.
B) 4 m/s.
C) 12 m/s.
D) 48 m/s.
E) none of the above
Answer: A
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In a neutron star, the protons and electrons are fused together, leaving only neutrons
Indicate whether the statement is true or false