Asked by Marcus

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?

Answers

Answered by Damon
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
Answered by Marcus
0,0 is the origin there is no repelling charge
Answered by Damon
Then there is no force on the proton and it will keep going forever with infintesimal velocity.
Answered by Marcus
So what's the minimum speed ?
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