Physics

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-fourth its original speed. What is the mass of the second ball?

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  1. mV=m(-1/4 V)+MV'

    1/2 mV^2=1/2m(V^2/16)+1/2MV'^2

    form the first equation:
    V'=mV(5/4)/M
    Put that into the second equation for V', and solve for M

  2. The guy in the top is right !

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  3. 5/3m

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