Question

how can l solve instantaneous acceleration in time interval where am not giving equation but graph Vx(t)

Answer 1

First of all, the derivative of V(t)=A(t) where A(t) is the acceleration function.

if you have the function for velocity you can take it's derivative and that will give you the acceleration function.

Instantaneous acceleration is just the value of your equation at some point in time t.

I can give you a more specific answer if you type the whole question out!

Answer 2

determine to the best of your ability the slope of the tangent to the curve at the given point