The ball is thrown at positions two and three potential energy is decreased and kinetic energy is increased positions five and six potential energy is decreased and kinetic energy is increased. Is this true?

Answer 1

No, this statement is not entirely true.

When the ball is thrown from positions two and three, its potential energy is indeed decreased as it moves higher in the air. However, the increase in kinetic energy depends on the reference point. If we consider the start (position two or three) as the reference point, then yes, the kinetic energy increases as the ball gains speed during its descent. But if we consider the highest point it reaches as the reference point, then the kinetic energy decreases as the ball slows down while rising to positions five and six.

Similarly, when the ball reaches positions five and six, its potential energy decreases as it moves lower. However, the increase in kinetic energy also depends on the reference point. If we consider the start (position five or six) as the reference point, then yes, the kinetic energy increases as the ball gains speed during its descent. But if we consider the highest point it reaches as the reference point, then the kinetic energy decreases as the ball slows down while rising towards positions two and three.

So, it is incorrect to claim that the potential energy decreases and kinetic energy increases at positions five and six without specifying the reference point.