Question

before force: object a is traveling at medium speed to the right
during force: a medium force is exerted on object a to the left
after force: object a stois
correct
not correct

Explanation:

Step1: Analyze the force - motion relationship

According to Newton's second law \(F = ma\) (where \(F\) is force, \(m\) is mass, and \(a\) is acceleration). The force is in the opposite direction of the initial velocity. The acceleration \(a=\frac{F}{m}\) (assuming mass \(m\) is constant) will decelerate the object.

Step2: Consider the effect of a medium - sized force on medium - speed motion

A medium - sized force acting for a certain time (implied in the "during force" stage) on an object moving at medium speed will not completely stop the object. If the force were large enough (or acted for a long - enough time, but here we assume the force is just "medium" in magnitude as described), it could stop the object. But with a medium - magnitude force opposing a medium - speed motion (and no information about an extremely large mass or an extremely long time of force application), the object will slow down but not stop.

Answer:

Not Correct