A ball of mass m makes a head-on elastic collision with a
A ball of mass m makes a head-on elastic collision with a second ball (at rest) and rebounds with a speed equal to one-fifth its original speed. What is the mass of the second ball? (Use the following as necessary: m)
m2=__________.
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a ball of mass m makes a head-on elastic collision with a second ball at rest and rebounds with a speed equal to
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