Because gravity accelerates all objects the same regardless of their mass
Red has a longer wavelength than yellow
You need the triangle to help work it out.
Force (pressing force) = Pressure x Area.
1. Force/ Area - 10/2 = 5N/m2
2. (Same as Q1) 70/0.2 = 350N/m2
3. (Same as Q1) 300/0.01 = 30000N/m2
4. Force/pressure - 500/20 = 25m
5. Pressure x Area - 15000 x 0.003 = 4.5N