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Hi
Find the angle formed by the strings by using sine law (trigonometry) : a /sin a = b/sinb = c/sinc . a=5cm , b= c=50 cm , angle b = angle c
1. u can find the force on the ball by simply using the coulombs law f =kq1q2/r2 where r = 5cm .
2. now since u know the angles, find the resultants in the respective directions by taking components of the force in that direction
3. Draw force body diagram of the ball and balance the forces along the string because it is unstretchable, hence u can find the tension in the string at that instant
4. after that , calaculate acceleration perpendicular to the string by taking into account the components of tension , wt and eletrostatic force in that direction,.
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