2000010803

Given the position-versus-time graph (in black) of an object in motion and the tangent line to the graph at the time point of $10$ seconds (in red), find the instantaneous velocity of this object at $10$ seconds. (Hint: Instantaneous velocity can be expressed as the derivative of position function with respect to time: $v(t)=\frac{\mathrm{d}s}{\mathrm{d}t}$.)