please help lol- brainlist to whomever- P. S---> Do it all please, and don't get any wrong. Then you get brainiist.

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

What is the measure of a change in an objects velocity?

What object a collides with object b and bounces back its final momentum is?