Which of these is the easiest way to do 20 newton meters of work?
A. Applying 20 newtons of force over a distance of 1 meter.
B. Applying 2 newtons of force over a distance of 10 meters.
C. Applying 4 newtons of force over a distance of 10 meters.

f=ma newton

f=100x2.5=250n

there are no contact forces mentioned on the list of choices that you've provided.

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hope this !