Question

write the definition of instantaneous speed​

Answer 1

The instantaneous speed is the speed of an object at a certain instant of time. If the position is a function of time, then the speed depends on the change in the position as time changes. ... Speed is a scalar quantity, meaning that it has a magnitude (a value), but no direction.

Answer 2

hey Mate here is your answer ;

Occuring, done, or completed in an instant ; an instantaneous response. existing at or pertaining to a particular instant; the instantaneous position of the rocket....

hope this helps...