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When the object is at rest, the acceleration is zero. so the net total force acting on the body from all directions should be zero. when the object is moving with constant velocity, the acceleration is zero, so in this case too, after the motion is started, the force on the body should be zero. when the velocity is increasing, some acceleration is present, so some force should be present in the direction of the motion.

These are the various cases which can be explained by the equation:

Force = Mass * Acceleration.

here the mass remains constant, so acceleration depends on the net force

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