I am a physics student and my teacher told me, to find the instantaneous velocity of an object, reduce the time interval to a very small extent. May the time interval be very very very close to 0, then, the velocity you find is termed as the instantaneous velocity.
Ok. But no matter how many times you say ‘ very very very...’ , there are still going to be infinite points between the ‘ very very very’ close points!
So, how can you apply the approximation? Thanks!