Suppose Particle A has a mass mo and is moving at a speed of $0\mathrm{.}8$c$.$ Suppose Particle B has a mass $4$mo$/3$ and is moving at a speed of $0\mathrm{.}6$c$.$ Both particles are moving in the same direction

$3.$ Which particle has the larger momentum?

$4.$ What is the total energy of Particle A$?$

According to observer O$,$ at what x$$ position does the flash occur? $(1$ point$)$

$4.$ According to observer O$,$ at what y$$ position does this flash occur? $(1$ point$)$