Question

A body is dropped from rest at a height of 150m and simultaneously another body is dropped from rest a point 100m above the ground. What is the difference between their heights after they have fall for 3 seconds?

Answer 1

$$y_1=h_1-0.5gt^2\\y_2=h_2-0.5gt^2\\d=y_1-y_2=h_1-h_2=150-100=50\ m$$