Consider
.
The potential difference `V_(A)-V_(B)` is.

Explanation

From the condition given in the question, it is clear that total distancen `(=" velocity"xx"time")` will be equal to the circumference of circular path
i.e., `v_(B)t+v_(A)t=` circumference o fcircular path
`1.5t+0.7t=2piR=10pi`
`therefore" Time",t=(10pi)/(2.2)=14.3s`
Acceleration, `a=(v_(B)^(2))/(R)=0.45ms^(-2)`