When unbalanced forces act on an object, the object accelerates friction becomes greater than the net force the objects speeds up the net force is zero?

When an unbalanced force acts on an object, the object accelerates. We can immediately rule out B and D, as friction changes based on the material and by applying a force the net force can’t be zero. It can be easy to say that the object will speed up after the force is applied (and it often does!), but take a braking car, for example. An external force of friction is applied to the brakes, causing an acceleration but in such a fashion that the car slows down. So, although an object can speed up after a force is applied, it isn’t always guaranteed.

Hope this helps!

i think they are all correct

explanation:

they seem good

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle