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College Physics

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A proton is put on the positive Y axis a large distance (100km) from the origin. What is the minimum speed required in the - Y direction so the proton will just reach the point (0,20) cm?

  • College Physics -

    Is there some sort of repelling positive charge at the origin or what ?
    If so the kinetic energy at infinity has to equal the potential energy at 20 cm

  • College Physics -

    0,0 is the origin there is no repelling charge

  • College Physics -

    Then there is no force on the proton and it will keep going forever with infintesimal velocity.

  • College Physics -

    So what's the minimum speed ?

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