Please tell answer of Q8)

Dear Student, Yes. In the absence of any force on the object, i.e. F = 0, ma = 0 (as F = ma). Since m ≠ 0, a = 0. In such a case, the object is either at rest or in a state of uniform motion in a straight line. In the latter case, there is a displacement of the object without any force acting on it. Work done will be zero as force is zero. Regards.