The rate at which velocity is changing at a given instant is described by
-instantaneous acceleration
-average speed
-constant speed
-vector addition

-instantaneous acceleration

Explanation:

As we know that the acceleration is defined as the rate of change in velocity and it is given by the formula

here we know that

= change in velocity

= time interval

now if the time interval is very small then this instantaneous change in velocity with respect to small interval of time is known as instantaneous acceleration.

so correct answer will be

-instantaneous acceleration

a skateboard rolling across the street - apex

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation