Which of the following combinations of forces keeps the cart rolling towards right with a constant velocity?

A = 11 N, B = 12 N

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A = 12 N, B = 12 N

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A = 12 N, B = 13 N

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A = 10 N, B = 15 N

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Solution

The correct option is B $A = 12 N, B = 12 N$
According to Newton’s first law, in an inertial frame of reference, an object continues to be in the state of constant motion (or rest) until a net external force acts on it.
Here, the summation of forces, or net force on an object must be zero to keep it in constant velocity.
Here, the forces are in opposite directions, hence their magnitude should be equal, so that the summation of force on the object is zero. Hence, $A = 12 N, B = 12 N$ .

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