For work to be done on an object, * (a) a force must be exerted, but the object must remain stationary.

(b) a force must be exerted on an object, but it doesn't have to move.

(c) an object must move, but no force is required.

(d) an object must move some distance as a result of a force.

No bots or i will report u

car stops. he keeps going = he has inertia

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

b.

explanation:

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this