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Answer the question please??????please

Solution,
When 1 N of force causes a displacement of 1m in an object the work done is said to be 1J.

The work is said to be zero if force is acting perpendicular to the direction of displacement of object or force causes no displacement.

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3) 1 Joule is amount of work done when a force of 1 Newton displaces a body through a distance of 1m in the direction of the force applied. Joule is the SI unit of work. 

4)Work done by the force of gravity on the object is zero. Force of gravity acts in the vertical downward direction and the distance covered the the tiobj of force, the horizontal direction. As there is no displacement in th hence the work done is zero.
 
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