A child is riding in a hot air balloon that rises from the ground with uniform speed. At time Ti, the child drops a marble through the floor of the balloon's basket. The marble falls with uniform acceleration of g = 9.8 m/s2 and hits the ground at T seconds later. Find the height of the hot air balloon at time T.

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm