For a system to follow the law of conservatio | vedclass

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(D) According to Newton's second law of motion, the rate of change of linear momentum is equal to the net external force acting on the system:$F_{ext}

Vedclass · Accepted Answer

$(1)$ or $(2)$

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(D) According to Newton's second law of motion, the rate of change of linear momentum is equal to the net external force acting on the system:$F_{ext} = \frac{dp}{dt}$If the total external force $F_{ext} = 0$, then $\frac{dp}{dt} = 0$, which implies that the linear momentum $p$ is constant (conserved).In the case of a collision, if the time interval $\Delta t$ is extremely small (negligible) and the external force is finite, the impulse $J = F_{ext} \cdot \Delta t$ approaches zero.Therefore, for a collision, the linear momentum is conserved if the external force is zero $OR$ if the external force is finite and the collision time is negligible.Thus, both conditions $(1)$ and $(2)$ satisfy the requirement for the conservation of linear momentum.

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