4. A simple accelerometer can be made froma U-tube containing water as in 200mm Figure. 1) When the acceleration of a car with the U-tube is a [m/s?] in the horizontal direction (x-direction), find the relation between a and the level difference h [m]. 2) When H vertical tubes at a = 0 is 250 mm, find the maximum accelaration which h = 400 mm and the water level ho for both H h。 can be measured by this accelarometer. Use g = 9.8 m/s? and pwater = 1000 kg/m?. y water x