When a force is applied to an object, what must occur for work to be accomplished on the object

When a force is applied to an object the object "HAS to be traveling in the same direction as the force." If you put force in a object but it's moving in the opposite direction it would decrease the speed of the object or cause the object to come to a complete stop but if you apply force in a object in the same direction it''s moving in it would increase the speed of that object and cause the object to move faster.

Hope this helps!

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s