A) When the vector sum of all the forces acting on the body is zero.
B) When a body is very heavy
C) When the body is very light
D) When the body is a point body
Correct Answer: A
Solution :
Referring formula\[F=ma\]. Thus acceleration will be zero, when resultant force is zero. In option , the point body is to be considered. A point body does not mean a body of zero mass. A point body or a particle is ideally a piece or quantity of matter having practically no linear dimensions but only a position. The measure of this quantity of matter is the mass of the particle. It is a usual convention to imagine bodies as point objects when we are only concerned about their mass and not about the distribution of mass. Thus earth can be considered as a point body when we describe its motion about sun.
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