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Physics, 19.08.2019 06:00 yarrito20011307

Which would best reduce the amount of energy needed to pull a wagon up a ramp?
1.increasing the slope of the ramp
2.reducing the friction between the wagon wheels
3.reducing the length of the wagon handle
4.increasing the friction between the wagon wheels

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Which would best reduce the amount of energy needed to pull a wagon up a ramp?
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