When a ball bounces off the ground, which of the following changes suddenly?

(Assume no loss of energy to the floor)

If an object moves at a non-zero constant acceleration for a certain interval of time, then the distance it covers in that time

A solid disc and a solid sphere have the same mass and same radius. Which one has the higher moment of inertia about its centre of mass?

Two substances of densities $$\rho$$₁ and $$\rho$$₂ are mixed in equal volume and their relative density is 4. When they are mixed in equal masses, relative density is 3. The values of $$\rho$$₁ and $$\rho$$₂ respectively, are