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A child applies a force F parallel to th...

A child applies a force F parallel to the x-axis to block moving on a horizontal surface. As the child controls the speed of the block, the x-component of the force varies with the x-coordinate of the block as shown in figure. calculate the work by the force F whin the block moves.
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(a) from `x =0` to `x =3.0m`
(b) from `x =3.0 m` to `x =4.0m`
(c) from `x =4.0 m` to `x =7.0 m`
(d) from `x =0` to `x =7.0 m`.

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