How to find instantaneous acceleration??

Question

I have to find the instantaneous acceleration when at 2 seconds a vehicle travels 4 m/s. How do i do this??

Answer 1

You have to make a few assumptions and guesses.

1. Was the car starting from 0 m/s (rest), and that is when the timing started?

2. Is the car travelling at a constant velocity at t = 2s? If yes, then acceleration is zero.