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MCAT Physics Question — Mountain Climb

A hiker climbs 500m in elevation gain as he walks a mountain trail. What is the approximate difference in pressure from the start of the elevation gain to after the climb? (Consider air incompressible, acceleration from gravity = 10m/sec2, and density of air = 1.2kg/m3.)   a) 12 Pa b) 500 Pa c) 5000 Pa