Question

The conservation of linear momentum can be applied in one direction while at the same time it can’t be applied in other directions.

• A. True
• B. False

Answer 1

The correct option is A True

1. Consider two balls $\mathrm{A}$ and $\mathrm{B}$ of mass $m_a$and $m_b$. respectively. Let the ball moves horizontally, and collide in the air. If we neglect air friction, the only force acting on the ball is in the vertical direction, and there is no force in the horizontal direction. The momentum along the horizontal direction is conserved.
2. Therefore, if the external force applied to the ball is zero, in a particular direction, then the linear momentum is applied in that direction only, whereas the momentum in other directions may change.

Hence, the given statement is True.