A charged ball falls onto a positively charged plate, and the speed of the ball decreases. What is the sign of the ball’s charge?

A charged ball falls onto a positively charged plate, and the speed of the ball decreases. What is the sign of the ball’s charge? How will its movement change if the plate is charged negatively

The ball is positively charged. If the plate is charged negatively, then the speed of the ball will increase as it approaches the plate – they will be attracted.

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