Something

TOP_SPEED = 5function GM:SetupMove(ply, mv)	if not ply:Alive() then return end	if ply:KeyDown(IN_SPEED) and ply:GetModel() == "models/player/police.mdl" then			ply.Velocity = ply:GetVelocity()		ply.AddVel = ply.AddVel or 2		ply.AddVel = math.Clamp(ply.AddVel * 2,2,100)		ply.Velocity.z = math.Clamp(ply.Velocity.z,1,TOP_SPEED)		mv:SetVelocity( (ply.Velocity * ply.AddVel) + (ply:GetAimVector() * ply.AddVel))			ply.JetPack:EmitSound(JetSound,100,math.random(150,155))				local edata = EffectData()		edata:SetOrigin(ply:GetPos() + (ply:GetForward() * -10))		util.Effect("jetpack_smoke", edata)	else		ply.AddVel = 2	endend