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in Physics by (61.1k points)

An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground the initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?

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Work done by the force of gravity, W = mgh.
Where h = difference in height of initial and final positions of the object.
According to question, the initial and final positions of the object lie in the same horizontal line. So h = 0.
∴ Work done W = mg × 0 = 0

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