Two positively charged balls having mass m and 2 m are released simultaneously from a height h with horizontal separation between them equal to `x_0`. The ball with mass 2 m strikes the ground making an angle of `45^@` with the horizontal. (a) At what angle, with horizontal, the other ball hits the ground? (b) Find the work done by the electrostatic force during the course of fall of the two balls.

Answer

(a) `theta=tan^(-1)((1)/(2))`
(b). `6mgh`