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Answered 2013-06-04 16:46:55

If the sum of all forces on an object is zero, then the object remains in constant velocity.

Constant velocity means motion in a straight line at a constant speed.

"Rest" is just constant velocity with a speed of zero.

If the sum of all forces on an object is NOT zero, then the object's velocity must

change. The change may consist of speeding up, slowing down, or turning in a

different direction.

If the sum of the forces is in the same direction as the object's motion, then

the object must speed up.

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