You measure it.
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In physics, work = force x distance.
Force times distance is called "Work" for the purposes of physics.
Use the information you're given, together with the Physics equations and formulas you know that deal with distance, to calculate the information that's required.
'Infinity' is just a concept of something that is without limit. You find infinity used in math (numbers) and physics (distance or a measurement like time), a lot. Infinity is not a 'place', so cannot be dreadful.
i think you don's understand difference between MOMENT & MOMENTUM MOMENT is use in statics means FORCE INTO PERPENDICULAR DISTANCE. MOMENTUM is use in physics means MASS INTO VELOCITY.actually both are part of physics so we ca't ask like this MOMENT IN PHYSICS AND STATICS??