the ideal mechanical advantage of an inclined plane or ramp is equal to the length of incline divided by height of the inclined plane. in equation
MA = L / H
since the ideal mechanical advantage of the given inclined plane is 2 and the length of inlcine is 3.8 m
MA = L / H
H = L / MA
H = 3.8 / 2
H = 1.9 m was paco above the ground