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To calculate the potential energy of an object at a certain height, you can use the formula:

Potential energy = mass × gravitational acceleration × height

Given: Mass (m) = 20 g = 20/1000 kg = 0.02 kg (converted to kilograms) Height (h) = 40 m Gravitational acceleration (g) = 9.8 m/s² (approximate value on Earth)

Potential energy = 0.02 kg × 9.8 m/s² × 40 m

Calculating the potential energy:

Potential energy = 0.02 kg × 9.8 m/s² × 40 m = 7.84 J (joules)

Therefore, the potential energy of the ball when it reaches the maximum height is 7.84 joules.

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