which formula can be used to express the law of conservation of momentum, where p = momentum?\n$p_i =…

which formula can be used to express the law of conservation of momentum, where p = momentum?\n$p_i = p_f$\n$p_i>p_f$\n$p_i < p_f$\n$p_i\neq p_f$
Answer
Brief Explanations:
The law of conservation of momentum states that the total initial momentum ($p_i$) of a system is equal to the total final momentum ($p_f$) in the absence of external forces.
Answer:
$p_i = p_f$