Velocity of a body is variable when

The velocity of a body may be variable even when it travels equal distances in equal intervals of time , howsoever small , if ……..

Velocity of an object is variable, then

Can the direction of the velocity of a body change when it's acceleration is constant.

The escape velocity of a body of mass 1kg when projected from the surface of the earth vertically is 11.2"kms"^(-1) . The escape velocity of a body of 1gm when projected at an angle 30^@ with the horizontal is

Statement I : If the average velocity of a body is equal in two successive time intervals, its velocity is a constant. Statement II : When a body travels with constant velocity its displacement is proportional to time.

Assertion : A kinetic energy of a body is quadrupled, when its velocity is doubled. Reason : Kinetic energy is proportional to square of velocity