Question

The rate at which velocity is changing at a given instant is described by

-instantaneous acceleration
-average speed
-constant speed
-vector addition

Answer 1

instantaneous acceleration

Answer 2

-instantaneous acceleration

Step-by-step explanation:

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

`a = (\Delta v)/(\Delta t)`

here we know that

`\Delta v` = change in velocity

`\Delta t` = 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.

`a_(ins) = (dv)/(dt)`

so correct answer will be

-instantaneous acceleration