Which of the following type of forces is responsible for keeping a cart at rest or maintaining it moving at constant velocity?
A
balanced forces
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B
gravity
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C
external forces
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D
friction
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E
unbalanced forces
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Solution
The correct option is A balanced forces A balanced set of force is one where all forces cancel out each other to give a zero resultant force.
Such force would cause no acceleration and hence no change in velocity of object, and thus it would continue moving at constant velocity or it would be in rest.