Apositron has a mass of 9.11 x 10^-31 kg, and charge qp = +e = +1.60 x 10^-19 c. it is moving towards an α particle (qα = +2e, mα = 6.66 x 10^-27 kg) with a speed of 3.00 x 10^6 m/s. at this instant the separation between the two is 2.00 x 10^-10 m. assume α particle stays at rest. (a) calculate the speed of positron at 1.00 x 10^-10 m from α particle. (b) what is the separation between the two when positron comes to rest?

Part a)

Part b)

Explanation:

As we know that alpha particle remain at rest always so the energy of system of positron and alpha particle will remain constant

So we will have

here we know that

also we have

now from above equation we have

Part b)

Now when it come to rest then again by energy conservation we can say

now here final speed will be zero

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explanation: