Question

If a balanced force act on a body then it will be possible to a body to move with uniform speed

Answer 1

Forces are said to be balanced when two equal and opposite forces acts on an object which makes net force to be zero. Balanced forces are acting means object will be rest. When unbalanced forces are acting on object it starts moving in the direction of force.

Example a book kept on table has two forces gravitational force acting downwards and normal force acting upwards. As two forces are equal and opposite the net force will be zero and object remains at same.

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Answer 2

Every body is accelerating and is changing its direction every instance. Therefore, uniform motion is not possible in real world. For me, uniform speed  is only an idealisation, that's all. ... Yes if the force is applied once, a body can keep moving if d surface is frictionless..
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