Answer:a & d
Explanation:
Given
Net force on object is zero i.e. [tex]F_{net}=m\cdot a_{net}=0[/tex]
[tex]a_{net}=0[/tex]
if net acceleration is zero therefore change in velocity is zero i.e. velocity is constant
It is not necessary that when an object is at rest acceleration on it is zero for example during Simple harmonic motion of spring mass system when mass is at maximum amplitude i.e. momentarily at rest then its acceleration is maximum.
