The correct answer is A. Installation of rigid metal conduit requires grounding and the grounding equipment used may weaken the structure.
So that we do not contaminate it with microorganisms or garbage or other human stuff.
The resultant force is 5N.So the box moves to right with constant acceleration.
Impulse describes the change of momentum. Since we don't know the momentum of the soccer ball before the hit, this question is hard to answer. If you assume the momentum of the ball before the hit was p = 0, then the change in momentum is just Δp = Impulse = mv.
