Question

if a pair of forces are unbalanced, the motion of that object will ________. non - existent be unchanged cancel out be changed

Explanation:

In physics (a subfield of Natural Science), unbalanced forces acting on an object result in a net force. According to Newton's laws of motion, a net force causes a change in the object's motion (speed, direction, or both). The other options are incorrect: "non - existent" is wrong as motion can exist; "be unchanged" is incorrect because unbalanced forces don't keep motion the same; "cancel out" is what balanced forces do, not unbalanced ones.

Answer:

D. be changed (assuming the options are labeled A to D with D being "be changed", if not, the correct option text is "be changed")