please helpme!! Two large oppositely charged horizontal plates separated bysome

Question

please helpme!!

Two large oppositely charged horizontal plates separated bysome distance create a uniform strong electric field E =107N /C in the area between them. A smallneutral metal ball located in between the pates with mass m =50g falls towards the bottom plate. After colliding withthe bottom plate it acquires a positive charge of q= 4*10-8C from the plate (the decrease ofthe plate’s charge due to this is negligibly small). Rightafter the collision the ball bounces vertically upward with
initial velocity v = 2m/s. How high willthe ball rise after hitting the bottom plate?

Explanation / Answer

the maximum high obtain when all kinetic energy tranfer intopotential energy Initial kinetic energy = final electric potential + finalgravitational potential 1/2 m v^2 = - E q h + mgh ==> h = 1/2 mv^2 / (mg - Eq) = 1m

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