When X is added water then the solution becomes suspension which is a heterogeneous mixture.

In second case, the particles settle down which were suspended throughout the bulk and the path became not visible.

Milk is a colloid with small particles of butterfat suspended through the liquid.

False, as momentum = Mass x Velocity So, it depends both mass and velocity of the body.

When resultant force acting on a body is zero, then body will be in equilibrium.