A person of mass m stands on roller skates facing a wall.After pushing against the wall with a constant force F he moves away, reaching speed v after a distance d.What is the work done by F?

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30-01-2020
Physics

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A person of mass m stands on roller skates facing a wall.After pushing against the wall with a constant force F he moves away, reaching speed v after a distance d.What is the work done by F?

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AFOKE88 AFOKE88 · Answer 1 · 2021-10-29T17:42:25+02:00

The work done by Force F after pushing and reaching a speed v after a distance d is; W = Fd

Newtons third law of motion states that "to every action, there is an equal and opposite reaction".

Now, since the person pushed against the wall with a constant force F, it means there will be an equal and opposite force acting as the reaction from the wall on him.

Now, since after pushing, he moves away a distance d, then the work done by him will be;

Work done = Force x Distance

Thus;

W = Fd

Therefore, in conclusion the work done by F is "Fd".

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