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pAΔt/2m<Vx>

p is the pressure

m is the average mass of the air molecule

<Vx> is the average x-velocity of the molecules

Assume collisions with the wall are elastic

By having elastic collisions, the KE is conserved and none of the KE is transferred in any other form

In class, we showed that p= -ΔP/Δt

where P is the average molecular momentum

pressure (p)=F/A

therefore -ΔP/Δt=F/A

F=ma => -ΔP/Δt=(ma)/A

that is where I have gotten so far. Not sure if I am doing this right or where to go from here

Please help!