Let v vector and a vector denote the velocity and acceleration of a body respectively. Then, a) a vector can be non zero when v = 0
b) a must be zero when v = 0
c) a may be zero when v is not equals to 0
d) a must be zero when v is constant
b) a must be zero when v = 0
c) a may be zero when v is not equals to 0
d) a must be zero when v is constant