Answer:
0
Step-by-step explanation:
Suppose the position vs time graph is given by x(t) = 0.4
To find the instantaneous slope, take the first derivative of the function x(t) to get x'(t):
x'(t) = 0
This means that there will be an instaneous slope of 0 anywhere along the graph. This is evident, as x(t) = 0.4 is a constant function outputting the value 0.4. As there is no change, the slope is always 0.