An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and 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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Zero

1

infinity

None of these

answer is A.

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Detailed Solution

An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and final points of the path of the object lie on the same horizontal line. The work done by the force of gravity on the object will be equal to zero.
As we know, work done is the product of force and displacement, and here, in this case, the Force of gravity acts in the vertically downward direction and the distance covers the object of force, the horizontal direction. As there is no displacement in the direction of gravitational force, the work done by the force of gravity on the object is zero.

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